Product Specifications: Alarm device for children and petsAlarm with no losable twinsAlarm prevents children or pets losing, purse or baggage being stolen, valuable things leaving somewhereEnvironment friendly,without radiationSearch function and ring and vibrationSteek,compact, easy to carryUser can freely adjust safe distance withinin a wide rang(0-25m,vary with the objects to be protected)Transmission size is in 24.5 x 7mm Brand Name: Juxin FOB Port: Shenzhen