Razer has been updating its gaming mouse lineup systematically over the past two years, and it's finally the Basilisk's turn to get a real update. The last update we saw to the Basilisk line was the Basilisk V3 Pro 35K in October 2024, which was basically just the Basilisk V3 Pro with a new sensor.

The Basilisk isn't Razer's most popular gaming mouse line, but it is the more versatile, all-rounder line for people who aren't chasing performance above all else. The Basilisk V4 Pro maintains the general design of its predecessor — a contoured, right-handed gaming mouse with bright RGB lighting and a handful of extra buttons, for the serious gamer who isn't trying to break esports records. It features Razer's newest Focus Pro 50K optical sensor, gen-4 optical mouse switches, and up to an 8,000 Hz polling rate, plus multiple forms of connectivity and up to 200 hours of battery life (over 2.4GHz at 1,000 Hz).

It is admittedly pricey, like all of Razer's flagship mice, at $169.99 for both colorways (black and white), and it launched with Razer's Mouse Dock V2 Pro — which is sold separately for $69.99.

Design and Comfort of the Basilisk V4 Pro

Following in the footsteps of its other recent next-gen mouse launches, Razer has kept the design of the Basilisk V4 Pro largely the same. The Basilisk V4 Pro has basically the same size and shape as its predecessor — it has a right-handed ergonomic shape with a contoured thumb rest and a hump that sits slightly back and to the left. It has large primary mouse buttons with shallow finger grooves, and a slight contour on its outer edge that makes it relatively easy to pick up and move.

It's not exactly the same as the V3 Pro, however. The V4 Pro has two new buttons, for a total of 12 programmable buttons on the mouse: the left and right primary buttons, three thumb buttons (instead of the usual two) and a trigger button in the thumb groove, a clickable tilt wheel (three "buttons" — center click and left/right click), two buttons above the tilt wheel, and an extra button on the left side of the left mouse button. The third thumb button and the extra button on the left mouse button are the new ones; the third thumb button sits in front of the first two and is set to open up Razer's AI prompt by default, while the extra button on the left mouse button is set to switch through profiles by default.

I'm... actually not a big fan of the new buttons. Or, well, I don't really think they're necessary — the Basilisk already had plenty of buttons for a mouse that's not all about having buttons, and I don't really see myself incorporating these new buttons into my workflow in the near future. The extra button on the left mouse button is a little too far forward — this is a very long mouse (it measures 5.02 inches / 127.5mm long), and the extra button is right at the front edge. I have medium-sized hands and relatively long fingers, and the button felt too far for me to press comfortably. It's not a big deal if you plan to leave it set as a profile switch button (which are often located on the bottom of mice), but it's not really viable as a real extra button.

Worse, however, is the location of the third thumb button — the AI prompt button — which is located in line with the other two thumb buttons. I generally have no issue with three rows of thumb buttons, as my daily driver is the Razer Naga V3 Pro, but this new AI button is the same size as the other thumb buttons and it pushes everything back a little. This puts the first thumb button (MB4) back too far to press comfortably (and that's a mouse button I use often). And while you can swap the buttons around, the AI prompt button is slightly too far forward. Basically, there are now three buttons where there should be only two, and they all feel slightly off.

The tilt wheel has three different modes you can switch through with the button right above it: two tactile modes (24 and 48 steps), and free-spin mode. I generally love free-spin mode, but the tilt wheel on the Basilisk V4 Pro is a little too sensitive and will backscroll if you even think about moving your finger near it. The precision-tactile scroll hits a great balance and feels great, however, so this didn't bother me too much.

The Basilisk V4 Pro comes in both black and white colorways; ours came in white, which has shiny black accents so it's a little more Stormtrooper than iPod. It has a smooth matte white body with dimpled rubber texturing for grip on both sides. While it's nice to have built-in side grips, I suspect they will wear down like the grips on the V3 Pro — and then you'll have to find or make your own grip tape, as the mouse comes with none. The mouse is roughly the same size as its predecessor, but it weighs less: the black version weighs 3.53 ounces (100g), which is almost half an ounce lighter than the V3 Pro 35K (3.95oz / 112g). It's not an ultralightweight mouse (or anywhere close), but the weight difference is noticeable and the mouse is definitely easier to pick up.

On the bottom of the mouse, you'll find pure PTFE feet — two near the front, a strip at the back, and a strip under the thumbrest, as well as a strip around the sensor, a power switch, and a connection switch button that is not programmable.

In the box, the Basilisk V4 Pro comes with a USB-A dongle, a USB-A to USB-C converter, and a 6-foot (2m) braided USB-C to USB-A cable. While the cable is braided, it is not one of Razer's flexible HyperFlex cables — it's meant for charging the mouse and plugging the dongle into your PC, not for using the mouse in its wired form.

Specs

Performance of the Basilisk V4 Pro

The Basilisk V4 Pro sports Razer's latest optical sensor, which is the Focus Pro 50K Gen-3 optical sensor. It has a maximum resolution of 50,000 DPI and a maximum speed of 930 IPS, and it can handle up to 90 G's of force. This is the third Razer mouse to feature this sensor (others are the Viper V4 Pro and the Naga V3 Pro), and it's a solid sensor that works with Razer's dynamic sensitivity (the sensitivity can be set up to change based on how quickly you move your hand) and rotation tool in Synapse. It tracks well across just about every surface, including glass that's at least 4mm thick.

The Basilisk V4 Pro isn't an ultra-lightweight mouse, but its shape and grippiness mean it's pretty easy to pick up and move quickly if you're playing an FPS. The trigger button is right under your thumb, however, so you may accidentally trigger (haha) it if you have a tendency to pick up your mouse a lot. The Basilisk's shape isn't quite as natural-feeling as that of the DeathAdder V4 Pro, but it's a comfortable mouse for a variety of games — from multi-button-needing MMOs to competitive shooters (though, perhaps not for peak competition). While I still take issue with the placement of the new buttons, it is nice to have a few extra buttons without jumping straight to 19.

The Basilisk V4 Pro sports Razer's Gen-4 optical mouse switches, which are rated for over 100 million clicks. The switches have a nice, crisp sound that's not too loud (not as loud as Logitech's, anyway), though it's not a mouse for those trying to minimize mouse clickiness. The primary buttons have a solid, tactile feel, and I had no issues with misclicks or double-clicks while I was testing. While the tilt wheel's free-spin mode was too sensitive for me to get to work properly, I love the precision tactile mode — it blends speed and tactility perfectly.

Features and Software of the Basilisk V4 Pro

The Basilisk V4 Pro is programmable with Razer Synapse 4 (not Razer's web-based version of Synapse). You can use Synapse to remap the mouse's 12 programmable buttons (14 programmable controls, if you include scroll up/down; the connection switch button on the bottom of the mouse is not programmable). Synapse has a variety of remap options, as well as a built-in macro recorder / editor. Synapse is also where you'll be able to customize the mouse further by tweaking things like the scroll wheel, DPI stages, and surface calibration. There's also a sensitivity matcher that will match the Basilisk V4 Pro's sensitivity to match that of your old mouse.

You can also use Razer's Chroma Studio to customize the mouse's lighting and sync it with games and/or your other Razer peripherals. The Basilisk V4 Pro has seven RGB lighting zones: a five-zone underglow strip along the bottom curve of the mouse, as well as one in the scroll wheel and one in the logo on the palm rest. The lighting is bright and the underglow's five zones blend nicely — the underglow strip is tilted outward so it's pretty visible when the mouse is just sitting on your desk.

Wireless Experience and Battery Life of the Basilisk V4 Pro

The Basilisk V4 Pro has three forms of connectivity: 2.4GHz wireless, Bluetooth, and wired (via USB-C), though it doesn't really come with a mouse-ready USB-C cable. Razer rates it at 200 hours of battery life over a 2.4GHz wireless connection with a 1,000 Hz polling rate, which is excellent. This number does drop to 54 hours at an 8,000 Hz polling rate, which is... still pretty good, to be honest.

The Basilisk V4 Pro launched alongside Razer's Mouse Dock V2 Pro, which is a wireless charging dock with built-in RGB lighting and an integrated 8,000 Hz wireless receiver. The Mouse Dock V2 Pro is sold separately for $70, and comes with a wireless charging puck that slots into the bottom of the mouse. It sits on your desk (it's small — 3.28 x 2.2 x 1.71 inches / 83.5 x 56 x 43.5mm) and serves as a magnetic dock and wireless receiver for your mouse. It has eight RGB lighting zones around the base, and it lights up to indicate battery level (flashes red when the battery is low). It's made for the Basilisk V4 Pro and V4 HyperSpeed, but it will also work with the Basilisk V3 Pro 35K, the Basilisk V3 Pro, the Cobra Pro, the Cobra HyperSpeed, the Naga V3 Pro, and the Naga V2 Pro (up to 8,000 Hz polling rate for all except the Naga V2 Pro).

The Basilisk V4 Pro is also compatible with Razer's HyperFlux V2 charging mouse pad, but you'll need to connect to your PC via the mouse's dongle for 8,000 Hz polling.

Bottom Line

The Razer Basilisk V4 Pro is an expected update to the Basilisk V3 Pro / 35K. The bump in battery life, from 150 hours in the Basilisk V3 Pro 35K to 200 hours in the Basilisk V4 Pro, is very nice (and 54 hours with an 8,000 Hz polling rate isn't bad, either). While I didn't like the new buttons, I'm sure some people will (although I find it difficult to believe that every mouse and keyboard needs a dedicated AI prompt button), and the reduced weight feels good even if, at 100g, it's still nowhere near the ultra-lightweight category. The Basilisk V4 Pro is a great gaming mouse for gamers who want something a little more exciting and versatile than a DeathAdder V4 Pro, but not as button-heavy (or as heavy) as a Naga V3 Pro.

For years, the standard polling rate for gaming peripherals — mice, keyboards, etc. — has been 1,000 Hz, which equates to a delay, or latency, of 1 millisecond. This is significantly higher than the standard polling rate for non-gaming peripherals, by the way, which is 125 Hz (8ms latency) — in fact, it's eight times as fast.

Well, over the last couple of years, gaming companies have been asking: What if we made the polling rate even faster than 1,000 Hz? What if we made it eight times as fast?

And now just about every single ultra-lightweight, esports-oriented gaming mouse that comes out has up to an 8,000 Hz polling rate. And, of course, this raises the question every time: Do you actually need a mouse with an 8,000 Hz polling rate?

And the answer is... probably not.

What is polling rate, and what does it mean?

Polling rate is, simply put, how often your mouse communicates with your PC. That is, how often it reports mouse movement and clicks to your CPU. At a standard gaming mouse polling rate of 1,000 Hz, your mouse is communicating with your PC 1,000 times per second — or, once every millisecond. Hence, a 1,000 Hz polling rate means 1ms latency. At a standard non-gaming mouse polling rate of 125 Hz, your mouse is only communicating with your PC once every eight milliseconds — or an 8 ms latency. At a polling rate of 8,000 Hz, your mouse is communicating with your PC once every 0.125 milliseconds — a 0.125 ms latency.

Polling rate affects both mouse movement (if the polling rate is low enough, mouse movement might be jerky) and, more importantly, click latency — you want your mouse clicks to translate instantly.

But it's important to keep this in perspective, because higher polling rates yield increasingly diminishing returns. Going from 125 Hz to 1,000 Hz is definitely noticeable — it cuts your latency from eight milliseconds to just one. But while going from 1,000 Hz to 8,000 Hz cuts your latency by the same factor, we're now talking about fractions of a millisecond. The average gamer can tell if their mouse is lagging by several milliseconds, but can they tell if their mouse is lagging by less than one millisecond?

Maybe. But probably not.

Why not?

Well, inability to distinguish whether your mouse is lagging by 0.875 milliseconds aside, there are some potential downsides to ultra-high polling rates. The main one being that your system may not be able to handle it. A higher polling rate means that the mouse is communicating with your PC more frequently, so this can affect CPU performance — if you don't have a pretty solid gaming CPU, you may see more of a performance hit than is worth the infinitesimal lower latency (which may not even end up being lower if performance issues cause latency). And if you don't have a gaming monitor with a high refresh rate (at least 240 Hz, if not higher), any perceived smoother mouse movement will be just that — perceived. (Of course, with a higher refresh rate you'll need an even better system to keep up with that and the 8,000 Hz polling rate, and... well, you get the point).

Another downside to an 8,000 Hz polling rate is battery life, because it drops significantly on wireless gaming mice. The battery life of the Corsair Sabre v2 Pro Wireless is a pretty impressive 120 hours at 1,000 Hz, but this drops to just 21 hours at 8,000 Hz. The Razer Basilisk V3 Pro 35K gets up to 150 hours at 1,000 Hz, and just 28 hours at 8,000 Hz. The Turtle Beach Burst II Pro does a little better, going from 150 hours at 1,000 Hz to 40 hours at 8,000 Hz, but it's still a significant drop.

And while you can cheat the system with select Razer and Logitech gaming mice by pairing them with either the Razer HyperFlux V2 or the Logitech PowerPlay 2 wireless charging mouse pads, you will need to pair the mice to your PC using their included (or, in some cases, sold separately) 8,000 Hz dongles — neither the HyperFlux V2 nor the PowerPlay 2 offer 8,000 Hz polling rates if you connect through the built-in receivers.

But... 8,000 Hz!!

You may not need an 8,000 Hz polling rate, but maybe it will make you feel better.

If any category of gaming mouse is going to benefit from lower latency, it's the esports category — where mice need to be lightweight so they can fly across surfaces, relatively small so they can be picked up when sliding them is too time-consuming, and hyper speedy and accurate so competitors can shoot people in the head without missing a beat. And so it's not surprising that flagship gaming mice like the Razer DeathAdder V4 Pro or the Asus ROG Harpe Ace Extreme (or the Asus ROG Harpe II Extreme Edition 20) tout 8,000 Hz polling rates.

But you don't have to spend a ton on an extreme edition flagship gaming mouse to max out your polling rate — several of Razer's older mice work with the company's Mouse Dock Pro and/or HyperPolling Wireless Dongle to get up to 8,000 Hz wireless polling rates, including the Razer Basilisk V3 Pro, and many of its newer mice come with 8,000 Hz polling out of the box (e.g. the Razer Viper V3 Pro, which is currently on sale for $110 at Amazon — 31% off its retail price of $160).

If you don't need a wireless mouse, Razer's DeathAdder V3 wired gaming mouse gets up to an 8,000 Hz wired polling rate (and is currently on sale for $45 at Amazon — 36% off its retail price of $70). Even Redragon, one of our favorite budget-friendly peripherals companies, has a mouse with an 8,000 Hz polling rate: the Redragon M916 ULT, which is wireless and ultra-lightweight (49g) and retails for just $50.

Ultra-high polling rates are creeping in everywhere, not just in the competitive esports market. Even Razer's recently launched V3 Naga Pro, which isn't even an ultra-lightweight, esports-oriented gaming mouse (it's a relatively hefty 23-button mouse for games that definitely do not need to worry about ultra-smooth, accurate mouse movement or click latency), can get up to an 8,000 Hz polling rate if you pair it with either the company's Mouse Dock Pro or HyperPolling Wireless Dongle (both are sold separately, naturally, because — again — you don't need this).

Corsair recently showed off its Nightsword v2 Wireless SD, a mouse with a built-in Stream Deck (sort of), which also has up to an 8,000 Hz polling rate (170 hours of battery life at 1,000 Hz, which drops to 47 hours with the lighting turned off and 25.5 hours with the lighting turned on at 8,000 Hz). And if you think that you can tell the difference between half a millisecond but not that extra quarter, there are also mice with up to 4,000 Hz polling rates, such as the HyperX Pulsefire Saga Pro and the SteelSeries Aerox 3 Wireless Gen 2.

And as for whether you need a keyboard with an 8,000 Hz polling rate, the answer is: absolutely not.