... touch buttons7, highlight the Backlight8, precision: ≤ ± 5%1. Detection of gas: flammable gas2, detection principle: Electrochemical methods3, detection range: 0 ~ 100% LEL,4, Resolution: 1ppm5 ... mode: sound, light, vibration alarm9, response time: ≤ 40s10, sensor life: ≥ 2 years11, use of the environment: Temperature -15degree~ +45 degree; Relative Humidity ...