The Fort Smart Security PIR Movement Sensor for the Smart Home Alarm System. This PIR movement sensor has an 8m detection range in a 110 degree field of view, to identify intruders and sound the alarm in an instant. Each sensor is battery powered (batteries included) meaning they can be placed in a room of your choice and away from an active power source. Each sensor links with the click of a button to the Smart Alarm Hub (sold separately) via radio frequency, from a distance of up to 80m (clear field of view). The whole system can be monitored, armed and disarmed on the go through the ClickSmart+ mobile app due to the Smart Alarm Hub's 2.4GHz Wi-Fi capability and Sim card support.