This device consists of Transmitter & Receiver with 2 selective function.
(A) 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.
(B) 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.
1) Working distance: 1 to 25m adjusable
2) Dimensions:
    a) Receiver: 60 x 36 x 15mm
    b) Sender: Diameter 24.5mm x Tickness 8.5mm                                                                                                       3) Materials: ABS with Receiver and Transmitter                                                                                                          4) Frequency: 433.92MHz, alarm output: 80dB, power supply: AAA battery(not included) for receiver, CR2032 for transmitter(included).