model: -probe gas : Natural gas, petroleum gas and other combustible gasesAlarm value, correction:Two points field correctionworking voltage : DC(4.5V) 3 AAA alkaline dry cellsperformance period: About 5 hoursrange : 0~100%resolution ratio: 1%intrinsic error : 5%preheating time: 30sresponse time : 10srecovery time: 30ssample mode : Diffuse typedisplay: LCD with backlight lightingdirect reading: Real-time concentration reading of the sensor, battery levelAlarm setting: Set the low report function and the high report functionalarm: Sound, backlight LED color switch, vibration indication and alarmOperating voltage: undervoltage indicationAudio tips: Higher beep frequency indicates a higher concentrationexplosion-proof: sign Exib IIB T3 GbApplicable temperature range:-10-50Suitable humidity range: Less than 95%RH(No condensation)size: 130x69x27mm(The length of the universal shaping tube is about 250mm)weight: About 222gMaterial: plasticcolour: blackPackage Contents:1 x Combustible Gas DetectorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.