This methane leak detector for domestic use, alerts the user via a visual signal (3 LEDs) and an audible signal (internal buzzer) to the presence of gas in the environment. It is designed to function as a gas detector with a voltage-free relay output. Contact ratings 8A-250Vac/30Vdc.The detector is calibrated to detect a concentration of gas equivalent to 10% of the LEL (Lower Explosive Limit). This value may vary according to the environmental conditions but will not exceed 15% of the LEL during the first 4 years of operation.