[Strong signal penetration] No need to worry about not receiving the signal and no sound [ wireless connection without wiring] The doorbell is loaded with batteries, connected to , no need to connect, and the signal is stable! [Super large wide-angle lens with twice the field of view] The corners of the door/courtyard/corridor/aisle are clear at a glance! [Human body sensing, abnormal reminder] connection, 24-hour automatic detection of abnormalities and capture, video (need to be equipped with storage devices) and push abnormal messages to mobile phones at the same time, reminding you at all times [Infrared high-definition night vision adopts large wide-angle lens] to avoid blind spots and blind spots, and adopt intelligent infrared recognition. When the light is insufficient, it will automatically switch to night vision mode, so that you can see any abnormalities outside the door at night, and monitor the safety of the whole family.