The DSC WS4945 Wireless Door Window Contact is a reliable and tested product designed for home security systems. Compatible with DSC and Qolsys brands, this door/window sensor is specifically meant to work with windows. With its model being the DSC WS4945, this contact offers peace of mind and added security to your home.

Taken from a working system.  Comes with original box and instructions.   Please see photos as they are part of the description.   Thanks.