Stefan Mileschin

With the Rival 3 Wireless, SteelSeries is pairing wire-free low-latency transmission technology with low power consumption, so we could get up to 400 hours of operation via two AAA batteries. For people which prefer a lower weight mouse (with the two batteries the whole setup is 106g), we can run with a single battery instead and the whole weight will go down to 96g, but we will lose half of the autonomy. It shares the ergonomic and durable design of the Rival 3 but employs a high-end 18000 CPI sensor for even better precision.

http://www.madshrimps.be/articles/article/1001249/