Customizable - Regardless of the size of your home and property, you can configure this system of motion detectors with a motion alarm sensor add on, or extra receivers for greater peace of mind. Compatibility - This motion detector alarm unit runs at 915 MHz. If you are expanding your Guardline wireless alarm system, please make sure you are purchg the same frequency as your existing set. Long Range - With 1 motion sensor and 1 receiver, each driveway sensor also has a wireless range of up to 1/4 mile for plenty of coverage around your property. Easy to Install - No need to call in an expensive technician for this home security system. Our outdoor motion sensor alarm is a plug-and-play device that installs in minutes. Security - Feel a sense of safety around your home with our weatherproof perimeter alarm set. It's sensitive to heat and motion during the day and at night, making it an alert system you can count on.