Specifications: It adopts 2.4GHz wireless technology provides reliable connection without interference. The wireless mouse is made from ABS material, and it'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 Set Material: ABS Wireless Mouse: Sensor Technology: Matte Optical Tracking Technology Buttons: Mute, 3 Million Times Resolution: 1500DPI Return Rate: 250Hz Battery: 1 x AA Battery (Included) Battery Life (Non-Rechargeable): 36 Months Wireless 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 Months Wireless Operating Distance: Up to 30 Meters (The actual wireless range varies with usage, settings and environmental conditions.) Features: Wireless, Battery Powered, Ergonomic Wireless 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's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Wireless Keyboard 1 x Wireless Mouse 1 x USB Receiver 2 x AA Batteries