Features: The siren can receive signals from other 433MHZ frequency detectors for alarm. 80dB super loud siren, built-in LED strobe light, strong alarm function. Low false positive, dual infrared detection components and micro-processing chip, high intelligence and high sensitivity. The farthest detection distance is 12 meters; the wireless transmitting distance can reach 80 meters. The detection angle is 110° horizontally and 60° vertically. Presented with a universal mounting bracket, built-in 4 AAA batteries. Specifications: Condition: Brand New Material: ABS Color: Shown as picture Siren: Plug Type: EU 100-230V Frequency: 433MHZ Distance: 80m Sound size: 80dB Light: Built-in 5050 LED strobe light Height: Approx.7cm/2.8in Diameter: Approx.7cm/2.8in Wireless Infrared Sensor (HW-03D): Frequency: 433MHZ Maximum Detection Distance: 12m Wireless Transmitting Distance: Up to 80m Detection Angle: Horizontally 110°, vertically 60° Battery: Built-in 4 AAA batteries Size: Approx.11*5.5*3cm/4.3*2.2*1.2in Package List: 1 * Sound and Light Siren (with 1 user manual) 1 * Wireless Infrared Sensor (built-in 4 AAA batteries, with 1 user manual, 1 screw bag, 1 universal bracket) 1、The siren can receive signals from other 433MHZ frequency detectors for alarm. 2、80dB super loud siren, built-in LED strobe light, strong alarm function. 3、Low false positive, dual infrared detection components and micro-processing chip, high intelligence and high sensitivity. 4、The farthest detection distance is 12 meters; the wireless transmitting distance can reach 80 meters. 5、The detection angle is 110° horizontally and 60° vertically.