Glorious Model O 2 Pro 4K/8KHz Edition @ TechPowerUp
 

Compared to the regular Model O 2 Wireless, the Pro 4K/8KHz Edition does several things differently. It comes with wired 8000 Hz polling, wireless 4000 Hz polling, optical main button switches, and no holes, yet manages to weigh no more than 59 g, albeit at the cost of no RGB lighting.

https://www.techpowerup.com/review/g...-8khz-edition/