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Up to 4 Detection Zones per Sensor: Create up to four unique detection zones with 4 sensors each, meaning up to 16 total sensors per receiver protecting your property. LED lights on the receiver indicate which sensor zone has detected movement so you can act quickly. The alarm sound of the 4th zone can be customized from among 36 available melodies. If you need custom ringtones, please install the PIR sensor in the 4th zone.
Order now: 1 By One 1000-ft Range Wireless Driveway Alarm (2 Sensors) $30 from woot.com