This is an electromagnetic lock that works with 12VDC, once powered it will release bolt and push open the door with weight within 0.5-4kg easily. The lock only need to be powered to unlock it, which means it has a very low consumption, it can be used in mailbox, vending machine, cabinet, and it also has a toggle for emergency.
Note: power-on duration should not exceed 200ms, or it may damage the coil in lock.