A wireless reed switch to suit the Rhino Watchguard Alarm System. The Watchguard alarm is a complete stand-alone security system, which is ideal for the home or business owner wanting an affordable security system without a monitoring service. It’s wireless design is perfect for renters as it requires no complicated cabling. It is very reliable and extremely easy to install and operate. If the alarm is triggered, both the external and internal sirens will sound to repel intruders.