TechPowerUp published a review on the ROCCAT Kone Pro Air
A quote from the article:
The Kone Pro Air is ROCCAT's first wireless Kone. Much like its wired sibling, it comes with PixArt's PAW3370 sensor, optical main button switches, and pure PTFE feet. At just 73 g, the Kone Pro Air is exceptionally light, and features both 2.4 GHz and Bluetooth connectivity, with more than 100 hours of battery life.ROCCAT Kone Pro Air Review