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, when the 2 devices leave each other more than the distance, the receiver will sound alarm and vibrate to remind the receiver owner. 3. When there’s emergency, the owner can push the find-button on the receiver to locate the child or the pets or luggage, then a beep be guided immediately. Characteristics: 1. No radiation. 2. Beep to alarm. 3. Freely set the distance from 0-60M, more than 60 meters in an open-air environment. 4. Water-proof desigh. 5. Sleek, Compact, Easy to Carry. 6. Low power detection. Specification: 1. Sound: 80DB. 2. Transmitter current: 2MA. 3. Receiver current: 5MA. 4. 1-1 matching, no interference. 5. Frequency: 433.92MHZ. 6. Transmitter:60 x 10 x 30mm; Weight:21.3g(battery include); Battery:CR2032×2. 7. Receiver: 15 x 67 x 45mm; Weight:31g (battery excluded); Battery:CR2032×2.