Electric Drop Bolt Lock DC12V Electronic Mortise Locks with Adjustable Time Delay Fail Safe Mode Access Control Power Su

1 100 brand new and high quality. 2 Secure mode: The door will lock while supplied with power, and unlock without power. 3 Especially suitable for wooden and metal doors. 4 It is made from durable and high aluminium alloy material, durable for use. 5 Special circuit design, the door will unlock until the power is cut off. 6 With no external interference, making it more stable and safer. 7 Has 0, 3, 6 seconds time delay adjustable.