Product Description SPECIFICATION: Can suit bothLeft and Right hand door (by rotating the lock 180°) NO (open when powered) fail Secure Operating Mode Can directly connect to outdoor camera of Electric Video Door Phone and open door without connect to extra DC 12V power supply (if video door phone supports NO unlocking mode) High-quality stainless steel / High anti-theft and high safety Double lock heads inside and outside With electronic-control unlocking unit and a spring adjusting balance unit Support manual unlocking, 3 keys included
