[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! [Support multi-user connection] Up to 11 users can connect to the doorbell The same user can connect to multiple doorbells [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.