Razer's Basilisk V4 Pro: 200-hour battery and an AI key reshape the thumb cluster

The Basilisk V4 Pro arrived on store shelves October 23, 2026, carrying more buttons and a longer battery than the model it replaces.

Razer's last refresh of this line came in October 2024, when the V3 Pro 35K shipped with a new sensor fitted to the existing V3 Pro body. The V4 Pro keeps the right-handed contour, the RGB lighting and the extra buttons. Inside, it runs a Focus Pro 50K optical sensor rated at 50,000 DPI and 930 IPS, fourth-generation optical switches rated past 100 million clicks, and polling rates reaching 8,000 Hz. It links over 2.4GHz wireless, Bluetooth or USB-C, and sells for $169.99 in black or white.

The button count climbs from ten to twelve. A third thumb button sits ahead of the existing pair and opens Razer's AI prompt by default; a button beside the left click switches profiles. Sarah Jacobsson Purewal, the senior editor who reviewed the mouse for Tom's Hardware, could not get comfortable with either. The profile key lands at the front edge of a 5.02-inch body, which she found out of reach even with medium-sized hands and long fingers. The AI key measures the same as its neighbors, pushing the cluster back until MB4 sits too far to press. Remapping did not fix the spacing. All three thumb buttons felt slightly off, she wrote, and asked whether every mouse and keyboard needs a dedicated AI prompt button.

Weight falls to 3.53 ounces, or 100 grams, down from 3.95 ounces and 112 grams on the V3 Pro 35K. The tilt wheel offers 24-step and 48-step tactile modes plus a free-spin setting; the free-spin mode proved too sensitive and backscrolled on its own, while the precision tactile mode drew praise. Battery life rises from 150 hours on the prior model to 200 hours at 1,000 Hz over 2.4GHz, dropping to 54 hours at 8,000 Hz. The sensor tracked on glass at least 4mm thick. No misclicks or double-clicks appeared in testing.

Razer launched the mouse alongside the Mouse Dock V2 Pro, a wireless charging dock carrying an 8,000 Hz receiver and eight RGB zones, priced at $69.99 and sold separately. The box holds a USB-A dongle, an adapter and a 6-foot braided cable. It does not include a HyperFlex cable or grip tape.

Here is how the line reached this point. October 2024 brought the V3 Pro 35K, which paired the V3 Pro body with a new sensor. Two years later, on October 23, 2026, the V4 Pro shipped with a reshaped thumb cluster, two additional programmable buttons, a lighter shell and a battery rated 50 hours longer than the V3 Pro 35K. Razer positioned it between the DeathAdder V4 Pro and the Naga V3 Pro.

The Tom's Hardware verdict lists feel, lower weight and battery life as strengths, and the AI button's effect on thumb-button layout, the price and the mouse's size as drawbacks. Purewal recommends it for players who want more functionality than a stripped-down shooter mouse but are not after a button-heavy design. The switches produced no misclicks in testing, and the shape suits everything from MMOs to competitive shooters, though perhaps not top-level competition.