New Wireless Door Bell Welcome Alarm Chime Motion Sensor Detector High Quality. Advanced microcomputer technology and automatic human sensitivity are applied to the quest saluting and alarm door bell. Extra ordinary performance, energy saving and easy to use. Strong sensitivity, non-mislead and anti-interference technology make it effectively detect the movement of the human in the detecting area of all environments. Meets different needs. It's suitable for dwelling house, tier building, multiple apartment, hotels, factories, hospitals or any other places. It doesn't only bring convenience but also the be at all happiness and security sense. Mounting height is adjust to 2M or so, mounted on the corner of the room is preferable. Survey horizontal angle 84°. So buy this and Get 49% Off for Wireless Door Bell.