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 magnetic sensor can sense the opening and closing of the door, 10mm action distance, up to 80m wireless transmitting distance. The magnetic sensor has built-in CR2450 button battery with large capacity for longer standby time. Compact and lightweight, easy to install, convenient in use, improve security. 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 Door/Window Magnetic Sensor (MC-06A): Working Temperature: -10 ~ 55°C Frequency: 433MHZ Movement Distance: 10mm Transmitting Distance: Up to 80m Size: Approx.6.9*3.3*1.5cm/2.7*1.3*0.6in 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) 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 (Each with 1 user manual, 1 rubber pad, built-in 1 CR2450 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、The magnetic sensor can sense the opening and closing of the door, 10mm action distance, up to 80m wireless transmitting distance. 5、The magnetic sensor has built-in CR2450 button battery with large capacity for longer standby time.