Model Number:W195 Connectivity:BT, 2.4GHz BT Version:5.1 Switch Lifetime:5 Milion Clicks Sensor:PixArt 3065 DPI:Up to 1600 DPI Number of Buttons:7 Polling Rate:125 Hz BatteryType:1 AA Battery Size: 108.4*71.2*69 mm Weight: 114g Power Rating:1.5V -- 15 mA Compatibility: Windows 7 or later & MacOS 10.11 or later What's in the box 1. GO COMFY W195 2.1 pCs AA Battery 3. USB Dongle 4. Quick Start Guide Box size: 94*144*77 mm N.W: 116 g G.W: 190 g Carton size: 49.5*40.5*31.5 cm N.W: 10 kg G.W: 10.3 kg Qty/ctn: 50 pcs 90% noise-reduced switches (5 million clicks lifespan) ensure quiet operation for office/study environments Dual-Mode Connectivity & 20-Hour Battery Seamlessly switch between Bluetooth 5.1 and 2.4GHz wireless (10m range). Powered by 1×AA battery (included) with 20-hour runtime