This is an Electromagnetic Lock Tap B, with this Electromagnetic Lock, you can install it on your door, window, and so on. It is a good choice for your smart home project.
Normally, the tongue of the lock is pops up, when you power it, the internal coil generates a magnetic force to attract the tongue. It responds quickly, just one second to complete unlock.
Note!!! In order to protect your lock, please don’t power the lock more than 5S.