2.4GHz wireless transmission, mini and compact, easy to carry.15 degree ergonomic design, wrist naturally vertical when using.High sensitive buttons, fast response.Anti-slip bottom and splash proof design make it more practical.USB receiver, suitable for PC or laptop.Type: Numeric KeypadMaterial: ABSButton: 18Connection Type: USB 2.4GHz WirelessWireless Distance: 10mBattery: 1 x AAA Battery (Not Included)Features: Numeric, Wireless, Anti-Slip, High Sensitive, Mini, Portable, Ergonomic DesignSize: 14cm x 8.5cm x 2cm/5.51" x 3.35" x 0.79" (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: (Battery Not Included)1 x Numeric Keypad1 x USB Receiver