Features Color-screen display, user-friendly interface.Bilingual choices:Chinese/English.Three alarm forms:sound/light/vibration .Data recording and review function, continuously record120,000 data logging.Charging function. Specification Test Gases: H2S Display Unit: %LEL Gas detection:EXMeasurement Range: 0~100μmo/molResolution: 0.1 Accuracy: ≤ ±5%FSIndication 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 batteryExplosion-proof Certificate NO.: CNEx 18.5122Explosion-proof Mark: Ex ib IIB T3 GbOperating Conditions: -20～50℃ / -4～122℉, < 95%Storage Conditions: -10～55℃ / 14～122℉, < 85%charging time:6-8hstandby 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 Monitor1 * Plastic Pipe1 * USB Cable1 * Gas Calibration Cover1 * Storage Box1 * User ManualSpecification: General Certificate CE Package Weight One Package Weight 0.81kgs / 1.78lb One Package Size 29cm * 18.5cm * 8cm / 11.42inch * 7.28inch * 3.15inch Qty per Carton 38 Carton Weight 30.00kgs / 66.14lb Carton Size 90cm * 62cm * 29cm / 35.43inch * 24.41inch * 11.42inch Loading Container 20GP: 164 cartons * 38 pcs = 6232 pcs 40HQ: 382 cartons * 38 pcs = 14516 pcs