Curtain passive infrared detector via unidirectional / bidirectional radio, 3 or 6m range / curtain, 868MHz frequency. EN50131 Grade 2 certificate. Immunity to solar rays: protection from the sun's white light and headlights, blocked by a special mechanism, real temperature compensation. Includes 90 ° support, interior installation, mounting height up to 3m. CR123 3V lithium battery included. Dimensions: 31.5 x 35 x 98.5 mm. Compatible with RISCO™ unidirectional and bidirectional wireless systems.