... , single hand operation;Audible and visual alarm 1.Product Name:Combustible Gas Detector(8800A+)High sensitive Ergonomic mold for nice handheld touching, single ... 650mAH Li cell employed, recharging anywhere 2.Specification:Detectionnatural gas, LPG, artificial goal gas and etc..Sensorplanar semiconductorBootup timein 60 secondsAlarm20Hz ~ 5KHzRange ...