Summary: Bought this item on a whim, but it turns out to be a great little device. Very clever to integrate a door video-intercom with your phone system. The outside unit (which houses the camera, doorbell and speaker) can be battery operated or if there is an outlet just behind the wall where you intend to install the chime you can just plug it in (run the power adapter wire through the wall). Cannot say how long the batteries would last.
Summary: Did not meet up to my expectations never knew you had to connect the wire from the inside of your house to the bell the only use of the batteries is for the doorbell chime not the video streaming omg so disappointed I really needed this doorbell Video Phone truly disappointed and upset
Summary: Very convenient. Good performance. Video and audio are good. It can be a perfect item if the engineers can make some improvements to its features including lighting all buttons on the handset so you can see what you are doing in the dark and linking the doorbell to the answering maching for outgoing message to visitors in lieu of answering the doorbell or when you are away.
Summary: I needed 2 sets, each with one main and 2 sub phones, total of six for all over the apartment. 3 are fine, 3 are lousy. I am replacing the lousy ones with a better brand. No more bargain brands for me. It's just not worth the agravation and wasted time. You waste time, gas, etc running around and crawling around plugging in etc. The one that works well works great, but the other has so much static on it that I can't hear well on it at all, same for its sub phones.
Summary: This little phone set as exceeded all of my expectations. It's easy to set up and works great. The video from the camera is not the best quality, but good enough to tell who the person is at the door. The microphone works really well almost to well. I would recommend this product 100%.