Advanced Sensing Technology: Detects levels of Combustible Gas, Oxygen (O2), Hydrogen Sulfide (H2S), and Carbon Monoxide (CO) with high accuracy High-Resolution LCD Display: Real-time data and system status displayed on a clear LCD screen, enhanced with LED indicators, audible and vibration alarms for increased safety Adjustable Alarm Points: Customize alarm triggers to suit specific safety requirements in different environments Quick Response: Fast reaction time of less than to detect gas presence and Reliable: Built with a robust casing and explosion-proof certification (CNEx 18.5122, Ex ib IIB T3 Gb), ideal for harsh working conditions Accuracy: When the measuring range is(0-50)mol/mol,maximum allowable error is:5mol/mol. When the measuring range is(50-1000)mol/mol,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 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, Less than 95% Storage Conditions: -10-55 / 14-122, Less than 85% Charging time:6-8h Standby time:more than 8h on end (slightly change with working state) (The product printed words depending on the batch, but this does not affect use) Color:As Shown Material:ABS Package Contents: 1 * Digital Compoud Gas Monitor Only 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.