... inventories,good performance, excellent prices,waterproof key,securi electronic locker lock with RFID key, zinc alloy(EM211) Material: zinc alloyKey: ... reminder, low voltage alarm, emergent external power supply.5. Handle or hand chain card, waterproof, high temperature resistance, easy ... alkaline battery b. provide centralized power supply of small size lock body)Alarm voltage: < 4.6 VStatic power: < 1 ...