... tag RFID,RFID tag,active RFID tag,smart tag,water-proof,can be used with reader locator to positioning Description1 ... MR3820A active electronic tag has the function of location and waterproof2.It is suitable to use frequency hopping ... or active sense availableIdentification range3-80mMaterialPET,stand high temperature and water-proofDimension85*55*5.5mmWeight20gBatteryButton Li-polymer inside,2 years ...