Multifunctional 28-key Numeric Keypad 28 Keys Rechargeable Bluetooth Wireless Numeric Keyboard

Broadcom Bluetooth 3.0 chip imported from the United States, deductible for passwords, multi-system compatibility, scissor foot structure design, comfortable feel.
Bluetooth solution: Broadcom 20730 chip Bluetooth module
Bluetooth protocol:
Bluetooth: 3.0
Working distance:
Barrier-free: about 10 meters
Working voltage: DC 3.7 V
Battery capacity: 350mAh
Working current: <5mA
Continuous working time: 70H (calculated by 350mAh battery)
Standby time: 90 days
Sleep current: about 50uA
Charging current: <150mA
Charging voltage: DC 4.7 ~ 5.2 v Sleep state The keyboard goes to sleep after 20 minutes of inactivity Status display LED 1.
LED is blue light: 2. The blue light will be on when power on, and the blue light will flash slowly 1 time after 1S and then turn off 3. Press and hold the pairing button for 3 seconds, the blue light flashes quickly to enter the pairing state, the device does not need to enter the password, just click the device connection 4.
Low voltage indication: the blue light flashes in the working state as low voltage indication