Features: 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 Our alarm kit is ideal for use at home, in the office, in the factory, in a store or in a shopping mall. Wireless The sensor range is 3 to 7 meters vertically and a range angle of 110 degrees. With Ringtones 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. Home Security Alarm Diaper Bell Passage Alarm Burglar Alarm