The product is a set of three Yale PIR Motion Detector Sensors, specifically designed for Yale SR & EF Alarms. These sensors are powered by batteries and are included in the package. The model number for this particular set is EF-3PIR, and they are white in colour. Perfect for enhancing home security, these sensors detect motion and are ideal for protecting your home from intruders with an efficient alarm system. Brand new but with box opened
eBay