A:AnswerYou set the area you want to monitor when setting up the camera. I set mine up to monitor a standard master bedroom. It's very sensitive and will detect "human" movement from the T.V.
A:AnswerYes, I can view my home thru the camera via my smart phone. The camera automatically starts recording when it picks up movement. I love this inexpensive and user friendly device. You can even speak through it. For example, you could say hello to an intruder. LOL!
A:AnswerEzviz C3A camera is battery operated, it comes with 5500 mAh Rechargeable Lithium Battery. To setup the camera and monitor it you need to download Ezviz App on your smartphone or table.
A:AnswerWe are not sure what you mean by weather underground, but if you mean in extreme temperature, then this unit will not work. Please note that this is an indoor camera and not an outdoor camera