Color LCD screen, English menu operation. Sound, light and vibration alarm. 2048 data storage, record alarm time, value, alarm records can be exported. Adopt 32-bit ARM low-power high-speed processor. Any combination of various gases. Large capacity battery, long working time. Histogram shows gas concentration. Model:BTQ-DR850 Detection Gas:Combustible Gas, Toxic Gas, Oxygen Detection Range:0-100% LEL Minimum Reading:1% LEL Production Grade:IP65 Alarm Mode: LCD Display + Sound & Light & Vibration Instrument Weight:250g Charging:USB,3.7V/1500mAh Product Size:150x68x28mm Alarm Point:High/Low Alarm Point Service Life:2-3years(depending on the environment) Using Environment:Humidity:(25-75)%RH/Temperature -20-50℃ Colour:Red Material:ABS Plastic Package Contents: 1 * Gas Detector 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.