This personal anti-losing alarm adapts macro-computer control technology with multi-coding. It protects valuable articles (or human being ) and anti-theft by compounding of receiver and transmitter. It becomes your first choosing for anti-losing. So convenient, It is used for mobile, wallet, luggage, package, childen,key and so on . Good looking and green environment protection. Specificaiton: receive and transmitter alarm triggered distance :1-25m adjusted anti-lost, searching function, alarm with vibrating convenient use, easy operation, small size, and portable.