... and visual alarm 1.Product Name:Combustible Gas Detector(8800A+)High sensitive Ergonomic mold for ... employed, recharging anywhere 2.Specification:Detectionnatural gas, LPG, artificial goal gas and etc..Sensorplanar semiconductorBootup timein 60 secondsAlarm20Hz ... LEL LED5 flashing, with buzzer Alarm modeLED, buzzerWorking temperature-20C ~ 70CWorking humidityless than 90% RHPower sourceLi cell ...