... place), tamperproof alarm, thwarted alarm4. LED and sound reminder, low voltage alarm, emergent external power supply.5. Handle or hand chain ... card), Waiter card, Guest cardParameter:Working voltage: DC 6V (a. 4 AA / 1.5 V x 4 alkaline battery b. provide centralized ... power supply of small size lock body)Alarm voltage: < 4.6 ...