It adopts 2.4GHz wireless technology provides reliable connection without interference.The wireless mouse is made from ABS material, and it& 39;s comfortable to grip.There is bracket on the back of the wireless keyboard, so you can adjust the height according to your needs.Item Name: Wireless Keyboard Mouse SetMaterial: ABSWireless Mouse:Sensor Technology: Matte Optical Tracking TechnologyButtons: Mute, 3 Million TimesResolution: 1500DPIReturn Rate: 250HzBattery: 1 x AA Battery (Included)Battery Life (Non-Rechargeable): 36 MonthsWireless Operating Distance: Up to 30 Meters (The actual wireless range varies with usage, settings and environmental conditions.)Wireless Keyboard:Battery: 1 x AA Battery (Included)Battery Life (Non-Rechargeable): 36 MonthsWireless Operating Distance: Up to 30 Meters (The actual wireless range varies with usage, settings and environmental conditions.)Features: Wireless, Battery Powered, ErgonomicWireless Keyboard Size: 289mm x 140mm x 26.5mm/11.38" x 5.51" x 1.04" (Approx.)Wireless Mouse Size: 113mm x 64mm x 32mm/4.45" x 2.52" x 1.26" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Wireless Keyboard1 x Wireless Mouse1 x USB Receiver2 x AA Batteries