Safeguard against mobile telephone Safeguard against kid & pet Safeguard against wallet & luggage Anti-lost function. Environmental protection:no radiation. Searchign function. Alarm with vibrating Small size and portable Description: Ring +vibration, Sleek, compact ,easy to carry, User can freely set safe distance within a wide rang,25m,vary with the object to be protected) Transmitter : dimensions : Diameter:24.5mm Thickness:7mm Weight:6.5g Battery:CR2032x1 Receiver : Dimensions :60(H)x36(W)x15(D0mm Weight :35.5g Battery :7#x1 How to use: Push the switch of transmitter to ? ON ? position, the transmitter?s indicator blinks and sends out signals. First push the switch o receiver to ? N-ON ? position, the host sounds ? di.. ? once indicating it is powered on, then sounds ? di.. ?twice indicating it has successfully learn current transmitter code. Wear the transmitter in your valuable things. Push the distance adjustment wheel of receiver to set an appropriate safe distance from the things to be protected, the recommended safe distance fro baggage. Wear the receiver on yourself or the owner. When the object to be protected leaves the owner farther than preset safe distance, the host will alarm OEM /ODM welcomed