Basic Function:
1. Wear the transmitter (smaller one) on the child or the protege and wear the receiver on the parent or the owner.
2. Set a distance by the wheel, when the 2 devices leave each other more than the set distance, the receiver will sound alarm and vibrate to remind the receiver owner.

Characteristics:
1. No radiation.
2. Beep & vibration to alarm.
3. Freely set the distance from 0-25M.

Specification:
1. Sound: 85dB.
2. Transmitter current: 1MA.
3. Receiver current: 3MA.
4. 1-1 matching, no interference.
5. Frequency: 433.92MHz.
6. Transmitter: 24.5(D)× 7(T)mm; Weight: 6.5g(battery include); Battery: CR2032× 1.
7. Receiver: 60× 36× 15mm; Weight: 35.5g (battery excluded); Battery: AAA 1PC (Receiver's AAA battery is not inclusive in the price. )