This pack of 4, PROFESSIONAL, stylish and compact QUAD PIR detectors are designed for connecting to wired intruder alarm system and are suitable for domestic and small commercial applications. Each PIR has a maximum detection range of 12 x 12 Metres and due to the advanced optics and sensing technology the PIR can be used in protected areas occupied by small to medium sized pets. These QUAD element PIR detectors are ideal for people who want a very high quality, professional PIR detector with superior false alarm immunity. Main Features 12 x 12 Metre maximum range Silent Operation Advanced Temperature Compensation Stylish, slim, asthetic design that complements any décor 9.5 ~ 16VDC 11ma Current Draw @ 12VDC Normally closed contacts going open.