[Signal penetration] No longer have to worry about no signal, no sound [ wireless connection without wiring] Doorbell into the battery, connection, no wiring, signal stability! [large wide-angle lens twice the field of vision] outside the door/courtyard/corridor/aisle corner picture at a glance! [human body sensing, abnormal reminder] connection, 24 hours automatic abnormal sensing and capture, video (need to match with storage devices) at the same time push abnormal message to the mobile phone, always remind [Infrared high-definition night vision with large wide-angle lens] to avoid blind areas, dead corners, and the use of intelligent infrared recognition, when the light is insufficient will automatically switch night vision mode, so that you can see outside the door at night any abnormal, monitoring the safety of the whole family, Manufacturer: SEVEQIS