WINTACT WT8802 Hydrogen Sulfide Monitor Professional Rechargeable Gas Sensor High Sensitive Digital Sound-light Vibration Alarm H2S Detector Features Color-screen display, user-friendly interface. Bilingual choices:ChineseEnglish. Three alarm forms:soundlightvibration . Data recording and review function, continuously record 120,000 data logging. Charging function. Specification Test Gases: H2S Display Unit: %LEL Gas detection:EX Measurement Range: 0~100μmomol Resolution: 0.1 Accuracy: ≤ ±5%FS 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) Weight: 215.4g(with battery and back buuton) Item Size: 71 * 153* 49mm Package included 1 * Hydrogen Sulfide Monitor 1 * Plastic Pipe 1 * USB Cable 1 * Gas Calibration Cover 1 * Storage Box 1 * User Manual