Purchased from an electronics retailer on August 3rd. Used for a few hours. M-XGM50MBSKBK 8-button mouse "EX-G PRO," co-developed with doctors, achieving the ultimate grip and the series' best functionality. Elecom (ELECOM) Color: Black Connectivity: Bluetooth, USB Features: 4-way scroll, multi-pairing, wireless, soundless, ergonomic design Movement Detection Technology: Optical Number of Buttons: 8 M size Perfect fit for those with a hand length of 165-180mm from the tip of the middle finger to the base of the palm. #Elecom #ELECOM #EX-G PRO #M-XGM50MBSKBK