Honeywell Slim Door/Window Contact Transmitter(ONLINE PRICE ONLY)
Honeywell's 5820L Slimline Door/Window Contact Transmitter 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-side adhesive tape.