WINTACT WT8811 Compoud Gas Monitor LCD Display Rechargeable Multifunction 4 in1 Combustible O2 H2S CO Gas Sensor Sound-light Vibration Alarm Features 1.Color-screen display, user-friendly interface. 2.Bilingual choices:ChineseEnglish. 3.Three alarm forms:soundlightvibration . 4.Data recording and review function, continuously record 5.120,000 data logging. 6.Charging function. Specification Compound Gas Monitor Range Measuring item and Unit 1.Combustible gas LEL %LEL 2.Oxygen O2 %VOL 3.Hydrogen sulfide H2S μmolmol 4.Carbon Monoxide CO μmolmol Range: 1.Combustible gas LEL: 0~100 2.Oxygen O2 : 0~30 3.Hydrogen sulfide H2S:0~100 4.Carbon Monoxide CO :0~1000 Resolution 1.Combustible gas LEL: 0.1 2.Oxygen O2 : 0.1 3.Hydrogen sulfide H2S:0.1 4.Carbon Monoxide CO :1 Accuracy: When the measuring range is(0~50)molmol,maximum allowable error is:5molmol. When the measuring range is(50~1000)molmol,maximum allowable error is:10% Indication model:LCD display real-time date and system state,LED,sound,vibration indication alarm Response Time(90%): Less than 30 seconds Alarm: Sound and light vibration alarm Alarm Point: Adjustable Working Voltage: DC3.7V, 1800mAh Battery Model: LP103450-1800mAh rechargeable lithium battery Explosion-proof Certificate NO.: CNEx 18.5122 Explosion-proof Mark: Ex ib IIB T3 Gb Operating Conditions: -20～50℃ -4～122℉, < 95% Storage Conditions: -10～55℃ 14～122℉, < 85% charging time:6-8h standby time:more than 8h on end (slightly change with working state) Item Size: 71 * 153* 49mm Package included 1 * Carbon Monoxide Monitor 1 * Plastic Pipe 1 * USB Cable 1 * Gas Calibration Cover 1 * Storage Box 1 * User Manual