RFID,RFID tag,active RFID tag,water-proof,smart card,can be used with reader locator to positioning ... smart tag RFID,RFID tag,active RFID tag,smart tag,water-proof,can be used with reader locator to positioning Description1.MR3820A ... or active sense availableIdentification range3-80mMaterialPET,stand high temperature and water-proofDimension85*55*5.5mmWeight20gBatteryButton Li-polymer inside,2 years ...