Features:  1.With a sensing range of 5-8m.  2. Four sounds, adjustable volume.  3. Easy to install and can be used with any doorbell kit.  4. The light flashes and alarms, not disturbing children who are taking a nap.  5. The protection level of the remote control transmitter is 6.The sensor and alarm have a sensing range of 118 meters and strong signal penetration.  7. The number of sensors and alarms can be freely combined.    Specifications:  Color: White;  Power receiver: DC 6V or 1.5V 3 AA batteries (not included);  Transmitter DC: 9V. 6F22 not included;  Range: 5-8 meters;  Working range: 118 meters;  3 modes: LED flashing, sound, LED flashing;  Ringer volume: 1-120 dB;  Operated sensor size: 10.5x6x4cm/4.1x2.4x1.6'';  Receiver size: 12x8.5x2.5cm/4.7x3.3x0.9'';    4 sound options:  1. Hello, welcome;  2. HELLO.WELCOME;  3. The sound of the police car;  4. Double Ding Dong;    Package Included:  2x Bell Alarm Operated Sensor;  1x Receiver;  3x Screws;  1x English Manual;