Mystery device

The device mounted above your doorbell chime there is a Doorbell Chime Adapter (also known as a digital chime module). It's primary function is acting as a power regulator and signal bridge between your low-voltage doorbell wiring and your new video camera. It's needed because doorbell cameras draw continuous power to record and stream video. Without this adapter connected to your internal chime terminals, the constant electrical draw can cause traditional mechanical chimes to buzz or hum constantly, or even prevent the chime from ringing at all when someone presses the button outside.