... which can increase pump into the pump suction)2, LCD digital display3, sound, light, vibration alarm at the same4 DC3.6V ~ 4. ... set (default setting: See table)6 easy touch buttons7, highlight the Backlight8, precision: ≤ ± 5%1. Detection of gas: flammable ... , response time: ≤ 40s10, sensor life: ≥ 2 years11, use of the environment: Temperature -15degree~ +45 degree; Relative Humidity: ≤ 95% RH12, ...