Chip: T5577Size:30*26*4mmMaterial: AB GlueOperation frequency: 125KHzDetecting distance: 3-10cmCompatible with all Door Entry systemEasy to carryWater resistant Each comes with Key ring includeNo external power required.Brand new key inductive card for entrance guard system.It applies to access control, hotel locks, staff attendance and school campus access and payment control, identification and security systems, parking lot entry and payment, social security management, transportation payment, municipal and ancillary service payment