Plug and play, easy to use. Mini and compact, easy to carry. High sensitive buttons, fast response. 15 degree ergonomic design, wrist naturally vertical when using. Anti-slip bottom and splash proof design make it more practical. Type: Numeric Keypad Material: ABS Button: 18 Bluetooth: 3.0 Connection Type: USB Wired, 2.4G Wireless, bluetooth-compatible Wireless (Optional) Wireless Version Battery: 1 x AAA Battery (Not Included) Features: Numeric, Anti-Slip, High Sensitive, Mini, Portable, Ergonomic Design Length: 14cm/5.51" (Approx.) Width: 8.5cm/3.35" (Approx.) Height: 2cm/0.79" (Approx.) Cable Length: 125cm/49.21" (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: (Battery Not Included) [USB Wired/Bluetooth] 1 x Numeric Keypad or [2.4G Wireless] 1 x Numeric Keypad 1 x USB Receiver