Model BYY-1-S Indoor Carbon Monoxide & Flammable Gas Alarm is kind of instrument for indoor use that can monitor leakage of harmful gas, such as carbon monoxide and flammable gas. The alarm applies world-advanced technology and imported Philip device for special design and production. It is featured by good anti-disturbance, stable performance, high sensitivity and reliability. Because it is small in volume, light in weight and easy to install, it is suitable to use in office, meeting room, kitchen and bathroom of family, and any places where flammable gas, including liquefied petroleum gas, nature gas and pipe gas, are used. When a certain amount of carbon monoxide or flammable gas are existed, the alarm will give out light and sound warning signals to warn people to open doors and windows or ventilating equipment to avoid accidents of poisoning, explosion or fire and protect your life and property from being harmed.