Rimax Child Guard is the ideal safety device to monitor your children in busy places such as shopping centres, shopping streets or open spaces like public parks and gardens. The device consists of a transmitter and a signal receiver. The transmitter looks more like a fancy watch so kids will love to wear it. The signal receiver constantly monitors how far your child is. The moment your child strays between 2 and 10 metres away from you, the transmitter sends a signal to the receiver, which activates and emits a sound signal to alert you of the danger. The signal receiver includes a field adjustment control, allowing you to adjust the standard distance between both units, so enabling you to decide at what distance you want to keep your child under scrutiny.

The minimum monitoring distance is 2 meters and the maximum is 10 meters. The moment your child is out of the maximum monitoring zone the receiver will sound continuously and will not stop until he or she is back in range. Available for £ 11.00 ($ 20) at Rimax online. First seen at Xataka
It is quiet similar to the Loc8tor which lets you find lost items and works on a similar concept.