Features:<br> <br> Communication range between sensor and receiver: 70 meters (open space)Sensor range: 3 at 7 metersSensor range angle: 110 degreesSensor power supply operation: 3 AAA batteries or 5V USB power supply (not included in delivery)Receiver power supply Operation: DC 110V - 240V3 volume control levels: high, medium, low2 Alarm mode: ringtones + LED display and display LEDTotally 38 different ringtones to welcome your guests For a different place to use<br> Our alarm kit is ideal for use at home, in the office, in the factory, in a store or in a shopping mall.<br> Wireless<br> The sensor range is 3 to 7 meters vertically and a range angle of 110 degrees.<br> With Ringtones<br> There are 38 different ringtones. You can adjust it using the switch on the side of the receiver. And the volume can also be adjusted.<br> Home Security Alarm Diaper Bell Passage Alarm Burglar Alarm