Description:
Turn up the receiver's switch to "on" position, it will beep constantly('dee...dee...'), and push one button on the transmitter , the receiver will stop beep after matching.
The receiver will sound alarm with 0.5-2 secondss(according to the distance), alarm will last for 4 seconds and then stop.

Specifications:
External Material: Plastic
Design: RF Wireless Technology
Power: Receiver: 1 x CR2032 Button Cell Battery(included)
          Transmitter: 1 x CR1632 Button Cell Battery(included)
Size: Receiver: 5.2 x 3.2 x 1.3cm
       Transmitter: 6.5 x 3.2 x 1.1cm
Indicator Light: Red
Body Color: Black, Gray, Pink, Purple, Yellow

Package included:  
1 x Transmitter
4 x  Receiver