Features: Ensure safety with our carbon monoxide (CO) alarm, featuring high sensitivity electrochemical sensors that detect CO concentrations and alerts you prompt with both audible and visual signal. This battery operated CO detector is equipped with a digital display and test/mute button, providing easy monitoring and operation without the need for additional wiring. For homeowners, electronic enthusiasts, and educational institutions, this device supports safe environment and enhances learning experiences through hands on practice. Perfect for use in kitchens, laboratories, schools, and industrial facilities, this alarm system ensures time detection of hazardous gas leaks, safeguarding your surroundings. This CO alarm offers versatility and convenience for diverse applications. Specifications: Shell Size:144x114x37.3mm Name: Improved Household Harmful Gas Alarm Kit Power supply: 7-9V Maximumly working current: 550mA(9V power supply) The program is open source and suitable for professional beginner entry programming. Simple assembly, no welding, with audible and video tutorials. Alarm when harmful gas is detected to exceed the standard. Detect whether the concentration of carbon monoxide exceeds the standard Check whether the concentration of liquefied gas, natural gas and city gas exceeds the standard. Check whether the concentration of ammonia, sulfide and benzene series steam exceeds the standard. The harmful gas concentration exceeds the standard, and the LED lights up to warn. Buzzers alarm when harmful gas concentration exceeds standard. Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings. Package includes: 1 Set Programmable Gas Alarm System