Honeywell Home robust 5816OD is a weatherproof, water-resistant outdoor wireless transmitter that provides excellent detection and performance in extreme temperatures. It operates in temperatures from -40° F to 150° F (-40° C to +66° C), (100% RH).The 5816OD also contains two unique zones. The first loop is a normally closed circuit contact that can have external devices wired directly to it. The second loop is a built-in magnetic reed switch that can be used to protect gates, sheds, detached garages or any other outdoor area with an exit/entry point. It is also an ideal way to protect outdoor equipment when using outdoor rated magnetic pull apart contacts.