Q: Is the camera always working or is the button required to video ?
A: The camera is not always on. The master intercom has Live View which lets you select the camera to see what is happening around it. This will not work in battery mode if battery saver is turned on. If it isn't turned on you will have to frequently charge the camera.
Q: Can this be plugged in for full time power when in use so there is no need to charge?
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