Features: 1. Mechanical Feel Digital Keyboard, Waterproof Splash Design, Higher Than The Design Of The Key Surface, Effectively Prevent Accidental Water Ingress Do Not Have To Worry About Tea Into The Keyboard Failure 2. Floating Keys, Mechanical Feel 3. With Backspace Key, Driver-Free, Easy To Carry, Plug And Play 4. Comfortable Feel, Zero Pressure, Strong Compatibility 5. When Removing The Keycaps, Do Not Let Water In. Description: 1. Number Of Keys: 19 (Keys) 2. Waterproof Function: Support Waterproof 3. Material: ABS 4. Applicable Models: 5. Button Technology: X Architecture 6. Product Size: 13.5 x 8.5 x 3.4cm 7. Backlight Function: No Backlight Support 8. Type: Numeric Keypad 9. Color: Black Power supply mode: 1 AAA battery (not included) Specification: Bluetooth Package Contents: 1 x 2.4G Receiver 1 x Numeric Keypad Only the above package content, other products are not included. Note: Light reflection 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.