Wireless personal alarm

Wear the transmitter (smaller one) on the child or the protege, and wear the receiver on the parent or the owner. Set a distance by the wheel, when the child leaves the parent more than the set distance, the receiver will sound alarm and vibrate to remind the owner. The working longest distance can reach 30meters when there's no obstacle. Distance is adjustable. One-one matching, no interrupt between two units. * Beep & vibration to alarm * freely set the distance from 0-25M * Transmitter current:2MA * Receiver current :5MA * 1-1 matching, no interference * Frequency : 433.92MHZ Transmitter: 33X28X11mm WT:10.8g(without battery) Battery:CR2032×1 Receiver: 46X38X15mm WT:35g(without battery) Battery: CR2032×1