This sensor is a three zone transmitter with three separate contact loops. With a demonstrated outdoor range of over a mile, the 5800 Series has the best performance of any transmitter available today
Link: http://strykealarm.com/equipment-door-window-sensor.html
Stryke Alarm Contact Information:
Email: mediarelations@strykealarm.com
Address:
Golden, CO 80401
Phone: 855-600-7001
Website: http://strykealarm.com/