The WiFi nest box camera has one DC input that accepts DC12V and one press button. You should wire DC12V power to the camera or connect the camera to the external battery pack to provide the power. The camera doesn’t have a battery cell built-in.
The receiver has one PoE network port which can power by a POE injector or PoE injector. It is compatible with the IEEE802.3af POE power solution. A single Ethernet cable can send both power and data to the receiver. However, the PoE injector is Not included in the kit. The receiver also has one DC input that accepts DC12V. The DC12V power adapter is included in the kit. The press button is designed for reset. It is the sync button for the camera. You can’t press the button to reset the camera or receiver.