Take care of you family: Communication range of up to 120m/400ft (the distance from the sensors to the receiver/alarm/chime) and detection range of the infrared sensor of approximately 2.5m/8.2ft range x 110°to keep you informed and safe.
Working Principle- Our sensor uses PIR to detect any movement within the detection zone(8.2ft range x 110°). Perfect for long or hidden driveways to allow you just a little extra warning before guests arrive.Dimension: Receiver: 80 x 80 x 30mm or 3.14 x 3.14 x 1.15in; Sensor: 86 x 55 x 36mm or 3.39 x 2.17 x 1.42in
Power Supply-1 Sensor: 2*1.5V AAA Alkaline Battery(batteries is included),or you can use USB cable to power on,USB can't charging the battery; Receiver: no battery required,just plug in any standard outlet,plug and play.
Expandable: If you have more than one driveway or area you would like to monitor, you can expand add more sensors or receivers as you like,just following the pairing instruction to make them paired before using is fine.
Receiver:4 levels of adjustable volume from 25-100 dB [much louder].Offer 52 elegant or custom music,from the traditional"Ding Dong" to various well know chimes [more choices].Build in blue led light for the hearing impaired.