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 for /Android//PC/laptop, etc. SLIM AND DESIGN-slim and portable. And it has 35 keys, which is fully functional. It is a good choice for external numeric keypad. specification Product name: Bluetooth wireless keyboard Battery capacity: 250mah Interface: usb interface colour: black Material: ABS size: 145x120x19mm Package Contents: 1*host 1*USB charging cable 1*wireless receiver Only the above package content, other products are not included. Note: Light 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.