The wireless adopts 2.4GHz technology, which can has a transmission space of 30 meters. With precise optical technology, it provides more precise control. It has mute operation, which causes no disturbance for your family. Item Name: Wireless Keyboard Material: ABS Number of Keys: 104 Interface: USB Battery: 1 x AAA Battery (Not Included) Features: Wireless, Mute, Computer Accessory Size: 43cm x 12.5cm x 2.5cm/16.93" x 4.92" x 0.98" (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 Keyboard 1 x Receiver 1 x Film