Features:
Power/ResetPress and hold for 3 seconds to power on/off; press briefly to reset to standby mode.
Code Setting (SET)Press briefly to enter code setting mode; press and hold for 5 seconds to clear the code.
Mode (MODE)Switch between prompt modes: vibration / beep / vibration + beep.
KeypadA 20-channel call keypad base, directly press the corresponding number to send the signal.

Specification:
Type: Queue Wireless Calling System
Colour: Black

Receiver:
Frequency: 433.92MHz
Receive sensitivity: -107dBm
Decoder: Learning code (AM)
Standby current: 10mA
Working current: 75mA (vibration)
Power: Built-in 360mAh rechargeable lithium battery
Charging voltage: DC 5V
Size: 100 x 50 x 11mm / 3.9 x 1.9 x 1.4 in
Weight: 40g / 0.09lb

Keypad call button:
Frequency: 433.92MHz
Standby current: 24mA
Transmit current: 100mA
Encoder: Learning code (AM)
Working voltage: DC 5V/6A power adapter
Adapter: AC 100-240V 50/60Hz
Size: 300 x 150 x 33mm / 11.8 x 5.9 x 1.3in
Weight: 812g / 1.8lb

Package Included:
1 x Call Button Keypad
20 x Receiver
1 x Power Adaptor
1 x Antenna
1 x English Manual

Note:
Please allow slight 1-2cm difference due to manual measurement and a little color variation for different display setting.