Innovative Anti-Lost Alarm/anti-losing alarm/anti-theft alarm consists of Transmitter & Receiver with 2 selective function Anti-Lost Function - Connect the transmitter on valuable things ( Such as Mobile Phone, Purse, Laptop, Camera or even your baby & pets, etc. ). Receiver switch to Anti-Lost and set up the reception range from (0~25M : may vary due to obstacle or interference). The Alarm turn "ON" when out of range. Searching Function - When the item got missing, simply switch the receiver to searching and the Alarm on transmitter will turn "ON" and you can find the item easily. Working distance: 1 to 25m adjustable Materials: ABS with Receiver and Transmitter Frequency: 433.92MHz, alarm output 80dB, power supply: AAA battery for receiver (not included), CR2032 for transmitter (included) We welcome you to order this Anti-Lost alarm