This papers is describes device is intended for use in household safety where appliances and heaters that use natural gas and liquid petroleum gas (LPG) may be a source of risk. Researchers in Thailand have found that almost cooking gas leakage in kitchen, Moreover, is poisonous and highly flammable. Its leakage usually leads to catastrophic fire and death. This project aims to design, construct, and attest a microelectronic device that detects the leakage of cooking gas and sends an SMS message to a designated mobile-phone informing the leakage.