EASY AND QUICK INPUT -The scissor-switch key and Bluetooth 3.0 give you a quieter, easier and quicker operation. And the transmission distance is up to 10 M.Long-term operation-Bluetooth numeric keypad has a built-in rechargeable battery.Wide compatibility -Numeric keyboard is suitable compatible with iMAC/Android/Microsoft/PC/laptop, etc. SLIM AND DURABLE DESIGN -slim and portable. And it has 35 keys, which is fully functional. It is a good choice compatible with external numeric keypad.specification Product name: Bluetooth wireless keyboard Battery capacity: 250mah Interface: usb inter facecolour: black Material: ABS size: 145x120x19mm Package Contents: 1*host1*USB charging cable1*wireless receiver Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.