Precise detection of combustible gas leaks. Sensitive to very low levels of methane, propane, butane and hydrogen. Reliable solid state sensor. Dual visible and audible alerts. Auto power off. Low battery warning. Unique compact ergonomic design. Variable alarm set point. Detection range: Methane: 120ppm - 1920 ppm. Propane: 40ppm - 640ppm. Warm-up time: less than 60 seconds. Response time: less than 2 seconds. Sensitivity: 40ppm. Flexible probe length: 18 in. (465mm). Indicator: Acoustic intermittent beep and visual LED. Operating temperature range: 23 to 113 F (-5 to 45 C). Auto power off: about 10 minutes. Power: 4 AA Batteries. Dimensions: 6.9 x 2.8 x 1.5 in. (175 x 70 x 38mm). Includes: Stainless flexible probe, batteries, hard blow mold case.