The DSC WS4965 is a wireless 433 MHz sensor that operates as a contact sensor with a reed switch, a tilt sensor, or a wireless transmitter. The sensor comes included with a magnet, and it has a built-in reed switch so that you can easily use it as a traditional door and window contact. The sensor can also respond based on tilting, which makes it ideal for monitoring a garage door that opens overhead. You can also connect up to two (2) NC wired contact sensors to the WS4965 so that it operates as a wireless transmitter. This is an incredibly versatile sensor with some great features, so we give it a 5-Star rating