By adding the 64-Zone Wireless Receiver to your HAI automation panel, you'll be able to use wireless sensors to trigger your security system. The HAI Wireless Door/Window Transmitter is a tamper-resistant wireless contact that can send instant or delayed alerts to your HAI OmniLT, Omni II or OmniPro II automation controller (all sold separately) via the 64-Zone Wireless Receiver (sold separately) if a door or window is opened or left open. By taking advantage of the HAI Wireless Door/Window Transmitter's zone inputs, you can actually use this transmitter to protect three zones. Just connect any normally closed external contacts using up to 25 feet of wire. Contacts and wire are sold separately. The HAI Wireless Door/Window Transmitter can also be used as a garage door sensor. It has a built-in mercury tilt switch that can send signals to your controller based upon the garage door position, so you'll know at a glance if you've left it open. Additional features include an LED low-battery indicator.