Features: Sensor: The siren can receive signals from other 433MHZ frequency detectors for alarm. 80dB super loud siren, built-in LED strobe light, strong alarm function. Wireless Infrared Sensor: 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. Wireless Door Magnetic Sensor: The transmission frequency of the door magnetic sensor is 433MHZ. It can not be used alone and must be used with 433MHZ alarm host. Wireless door magnetic sensor features anti-theft infrared alarm for home door and window, with emergency button. Ultra low power microprocessor, dual temperature compensation technology. Rugged and durable, suitable for homes, offices, sheds, garages, etc. Built-in CR2032 button battery for easy wall-mounted installation. 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 Wireless Door/Window Magnetic Sensor (MC-03B): Transmitting Frequency: 433MHZ Battery: Built-in 1 CR2032 button battery Size: Approx.8*3*1cm/3.1*1.2*0.4in Package List: 1 * Sound and Light Siren (with 1 user manual) 2 * Wireless Infrared Sensor (Each with built-in 4 AAA batteries, with 1 user manual, 1 screw bag, 1 universal bracket) 2 * Wireless Door Magnetic Sensor 03B (Each with 1 user manual, 1 rubber pad, built-in 1 button battery) 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、Wireless door magnetic sensor features anti-theft infrared alarm for home door and window, with emergency button. 5、Ultra low power microprocessor, dual temperature compensation technology.