Chengshou

Meant to work with a lock you already have.

Best for: Homes that already have a smart lock
Price note: Sample: sensors $199
Reviews counted: 2800

Chengshou is for someone who refuses indoor cameras and only wants to know the state of the doors.

Who it is for

An apartment that already has a smart lock.

Check this before you buy

It is not enough if you need video as evidence.

Strengths

People who do not want a lens indoors can still use it
It can remind you if you leave the door unlocked

Reservations

There is no video
You will not see how an entry happened

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