Founded in 1998, Razer is a US-based peripherals and gaming equipment company. The Viper V4 Pro improves on the Viper V3 Pro in many ways. Whereas the sensors of the Viper V3 Pro and DeathAdder V4 Pro largely iterated on PixArt's PAW3950, the Focus Pro 50K Gen-3 capable of 50,000 CPI found in the Viper V4 Pro is fundamentally new, with two major advancements. The first one is FrameSync, which essentially is a refinement of MotionSync. Whereas MotionSync synchronizes the timing of SPI reads and USB polls, FrameSync goes one step further and also includes sensor framerate in the synchronization. As there are basically no "excess" frames, battery life benefits from FrameSync as well. The second advancement is vastly improved jitter handling at higher CPI steps. Other features known from previous sensors, such as CPI adjustment in increment of 1 and asymmetric lift-off, continue to be around. The main switches are still Razer's Optical Mouse Switches Gen-4, and the scroll wheel utilizes an optical encoder from Razer, both of which are familiar from the DeathAdder V4. Though still called "Razer HyperSpeed Wireless Gen-2," seemingly matching the DeathAdder V4 Pro, the Viper V4 Pro has also been revised in this regard, featuring a different MCU and further improvements to latency and efficiency. As a result of these improvements, the Viper V4 Pro manages a cited battery life of up to 180 hours at 1000 Hz and up to 45 hours at 8000 Hz. 8000 Hz polling is supported in both wired and wireless operation. Further improvements to the structural design allow the Viper V4 Pro to weigh only 49 g, which is 4 g less than the Viper V3 Pro. Lastly, the Viper V4 Pro is the first Razer mouse in history compatible with Synapse Web, which is Razer's newly conceived web driver, along with Synapse 4.