These Battery powered wireless driveway alarms have an internal GSM dialler. This means the these can be used as a long range wireless driveway alarm covering a limitless range. The outdoor PIR on the driveway alarms are completely weatherproof. The movement detectors used are from Optex. These driveway alarm external PIR sensors are profetional security installer standard. Wireless long range driveway alarm systems for remote gates and private roads. These driveway alarm will alert your mobile phone by text.