Question about Arlo Pro 5

Exactly like this. See instructions.

Press the button on the battery charger firmly and the camera will open! Now insert the battery!

The oval magnet is the charging adapter for the Arlo camera.
The adapter cable is simply plugged into the socket. The magnetic connector can then be attached to the bottom of the camera - there is a small indentation where it automatically clicks into place.
The cable is relatively long, so in most cases the camera can be connected directly to a socket. If the distance is greater, we recommend using a suitable extension cable. It's all very easy!