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Wireless Motion Sensor Doorbell -Indoor Motion Detector Alarm, Door Chime for Business/Store/Office Entrance, Entry Alert Bell with Buzzer, USB/Battery Powered (1 Receiver + 2 Motion Sensor) 1 Receiver 2 Sensors music_UK_update_2021 and all computers can automaticallyWireless Motion Sensor Doorbell Indoor Motion Detector Alarm, Door Chime for Business Store Office Entrance, Entry Alert Bell with Buzzer, USB Battery Powered (1 Receiver + 2 Motion Sensor) Product Features Easy To Install & Expandable The motion sensor can be installed on a wall or door, the receiver plugged in for used, the sensor alarm fixed with screws or double sided tape. In addition, a combination supports connecting up to 20 sensors or