Motion detectors can keep an eye on your home when you're not around. The 433MHz Wireless PIR Motion Detector comes with a wide coverage lens that provides coverage up to 50 feet with a 60-foot width, and since it doesn't rely on wiring to signal the Professional 8 - 32 Zone Security System with X10 & Intercom upon a breach, you can rest easily, knowing that your home is safe, even in the event of a power outage. The Professional 8 - 32 Zone Security System with X10 & Intercom receives wireless signals through the 433MHz Spread Spectrum Wireless Receiver, which is required for any wireless transmission and is sold separately. The Professional 8 - 32 Zone Security System with X10 & Intercom consists of the Power 8 Zone Security Panel and Cabinet, the Power 8-32-Zone Alphanumeric LCD Keypad, a 12V Backup Battery, a 16VAC 40VA Power Supply, and the 30-Watt Weatherproof Siren, all required and sold separately. Door/window contacts, PIR motion sensors, and additional accessories are also sold separately.