Seamless bluetooth Connection: Powerful and secure bluetooth connection allows you to work efficiently within 10 meters. Backlit keys for any lighting environment: The keyboard with 7 colors and 3 levels of brightness lets you type day or night. Portable and Sturdy: Thanks to the slim and portable design, you can type anytime, anywhere. It's also made of aluminum alloy material to resist and scratches. Data Entry Shortcuts: Forget about searching an entire row of numbers without a numeric keypad. This keyboard is a must-have for those who require a lot of data entry but are not used to typing on that type of keyboard. Wide Compatibility: The keyboard is compatible with Windows and OS devices. After pairing, please configure the keyboard to the corresponding . Long-lasting rechargeable battery: It can work up to 220 hours without back light thanks to auto-sleep power-saving mode on/off switch button. Note: Battery life based on usage and computing conditions. Name: Backlit numeric keypad Support system: Windows, OS Number of keys: 34 keys bluetooth version: bluetooth 5.0 Keyboard life (key presses): 5 million Response speed: 30ms Wireless/bluetooth transmission distance: 10 meters Working current/voltage: 1.7~2.5mA/3.7V (without back light) with back to 155mA/3.7V Built-in lithium battery: yes Battery type & capacity: polymer soft pack 503035-500mAh lithium battery Charging time: 2 hours Use time: about 80 hours without the back light, about 2.6 hours when the back light is turned on to the maximum Standby time: no back light 10 months Colour:black-grey Material:aluminum alloy Size:15 cm x 11 cm x 2.5cm Package Contents: 1 x Bluetooth Numeric Keypad