Additional Motion Sensor Boost your alert system and your ability to never miss anyone coming through any door by adding another motion sensor transmitter.Businesses can benefit by having one at the front door for retail customers and back door for deliveries.Home owners can utilize it at any door or window.Motion Sensing for Any Area The motion sensor activates when movement occurs in the detection area of 16.4ft / 5m x 110 degrees. It sends a signal to the plug-in receiver and alerts you with a ringtone every time the sensor is activated.Cover as much as You Want.The Alert System allows you to pair up to 20 motion sensor transmitters to one receiver. Be able to cover every entrance or stairwell in your business or home.Easy to Install: Using the included wall anchors and screws, simply screw into position and your sensor is ready to use. Power consumption: <10mW Operating Frequency: 315/433 MHz +/- 2MHz Operating Temperature: 5°F to 140°F (-15°C to 60°C) Operating Range: 260ft in an open area Detection Area:16.4ft (5m) x 110° Size: 3.39x2.17x1.42in (86x55x36mm) Weight: 1.90oz (54g) Package list:1x Motion sensor transmitter1x User manualBattery: AAA 1.5v Alkaline Battery x 2