Passive infrared detector via unidirectional radio, reach 15 meters, frequency 868Mhz. EN50131 Grade 2 certificate. Dual PIR technology and MW X band, zero angle for short distance detection, Intelligent processing of the digital signal, real temperature compensation, triple resistance RFL incorporates, selectable by bridge, lid and wall or corner tampers , opto-relays to avoid the attack with large magnets. White sun and headlights, blocked by a special mechanism, real temperature compensation. Interior installation, mounting height 2.10 to 2.70 meters. Long life 3V lithium battery included. Dimensions 127.6 x 64.2 x 46.6 mm. Compatible with RISCO™ unidirectional and bidirectional wireless systems.