High quality & durability Stainless Waterproof Electronic lock. Rubber ring for better waterproofing. MF or RF card. Lifespan 100,000 openings. 4 or 6 AA batteries are required for its power supply. Battery life 10,000 openings. Indication for low voltage of batteries. Ability to operate the lock as a simple one. Logging and therefore printing of lock events. Electronic lock suitable for hotels, businesses & hospitals. Multilingual control program (software).