Note: This wired glass break detector needs to work with alarm system. Features: *8/12 bit microprocessor-controlled digital signal processing (8MHz). *Used to identify glass break or crash sound from other sounds by frequency. *It will not be fooled by the sound of pets, lightning, or any other sounds outside of its frequency range. *It will send signal to the Alarm System Main Unit when detects glass break sound. *Adjustable sensitivity: covers up to 9m (30ft) when set to high place and up to 4.5m (15ft) when set to low place. *7 frequency digital filters, digital amplifier gain and frequency fluctuation assessment. *It covers a large area of windows. Install to ceiling or wall close to window. *High-immunity to RFI and EMI signals Specifications: Digital Processor: 8/12 bits 8MHz Power Supply: DC 9-16V, 17mA Alarm Output: DC28V 0.15A, Normally closed Tamper Switch: DC28V 0.15A, Normally closed, cover removed open circuit Protection Range: Maximum sensitivity: 9 meters distance Sensitivity: Continuously adjustable Glass Window Size: glass of any size Detecting: Green LED on Alarming: Red LED on for 3s Material: ABS plastic Operating temperature: -20 Degrees C to 50 Degrees C Operating humidity: 95% Item Size: Approx. 9 * 6.8 * 2.5cm(L*W*H) Item Weight: Approx. 45g / 1.6oz Package Information: Package Size: Approach. 9.5 * 7 * 3.3cm / 3.7 * 2.8 * 1.3in Package Weight: Approach. 54g / 1.9oz Package List: 1 * Wired Glass Sensor(no cable)