The Honeywell 5820L is a slimline, wireless door and window contact transmitter that is nearly half the size of standard door/window transmitters. It is ideal for casement and double-hung windows. The 5820L provides a single zone of protection, and installs easily on doors or windows with the included mounting hardware or double-sided adhesive tape.
Product Features:
New sleek design (nearly half the size of competitors)
Easy-to-open case requires no special tools
1-Zone transmitter
Transmits supervisory, tamper and low battery messages
This was one of the best deals for buying an Alarm and had no problem programming several of these into my system. So easy to install and definitely worth the money!