Razer Basilisk V4 Pro: New AI Key Crowds Thumb Controls

Razer has released the Basilisk V4 Pro, a gaming mouse that trades some ergonomic comfort for new features. The device costs $169.99 and arrives with a 200-hour battery life, a 100-gram body, and a dedicated button for AI prompts. While the hardware specs improve on the previous model, the physical layout forces users to adjust their grip.

The most visible change is the addition of two new buttons, bringing the total count to 12. One button sits beside the left-click area to switch profiles. The other, located on the thumb, launches Razer’s AI prompt tool by default. Senior editor Sarah Jacobsson Purewal of Tom’s Hardware noted that these additions disrupt the natural hand position for many users.

The profile button is positioned at the front edge of the 5.02-inch device. For people with medium-sized hands, this location is too far forward to press comfortably without stretching. The AI button creates a different problem. Its presence pushes the existing thumb buttons further back, making the first one difficult to reach. The reviewer found that all three thumb controls felt slightly off, even after remapping.

Despite the layout quirks, the mouse is lighter than its predecessor. The black model weighs 3.53 ounces, or 100 grams. This is nearly half an ounce less than the 112-gram Basilisk V3 Pro 35K released in October 2024. The weight reduction makes the device easier to handle, though it does not reach the ultralight category. The shape remains right-handed and contoured, suitable for a wide range of game genres.

Performance remains consistent with Razer’s high-end standards. The Focus Pro 50K sensor supports up to 50,000 DPI and 930 IPS. It tracks on most surfaces, including glass at least 4 millimeters thick. The fourth-generation optical switches are rated for over 100 million clicks. Testing showed no misclicks or double-clicks. The mouse connects via 2.4GHz wireless, Bluetooth, or USB-C.

Battery life has increased from 150 hours to 200 hours at a 1,000 Hz polling rate over 2.4GHz. At the maximum 8,000 Hz polling rate, the battery lasts 54 hours. The tilt wheel offers two tactile modes and a free-spin option. The free-spin mode proved too sensitive, often causing accidental backscrolling, while the precision tactile mode received praise.

The Basilisk V4 Pro launches in black and white. It ships with a USB-A dongle, an adapter, and a 6-foot braided cable. The package does not include Razer’s flexible HyperFlex cables or grip tape. A separate Mouse Dock V2 Pro is available for $69.99. This dock includes an integrated 8,000 Hz receiver and eight RGB zones. It also supports several older Razer mouse models.

Tom’s Hardware positions the Basilisk V4 Pro between the DeathAdder V4 Pro and the Naga V3 Pro. The review cites the feel, lower weight, and battery life as strengths. The drawbacks include the AI button’s effect on the thumb layout, the price, and the slightly large size. The mouse is recommended for players who want more functionality than a basic shooter mouse but do not need a button-heavy design.