Feature: 1. Wide Application: Widely used in factories, homes, offices and public places so on. 2. Easy To Use: Large screen LCD backlit display, which can be read in the dark, save your labor. 3. Portable And Lightweight: Portable monitor, used to detect O2, temperature, ℃/℉ unit can be switched. 4. Accurate Detection: Quick response to gas detector, sound and light alarm instructions. 5. Electrochemical Principle Measurement: High measurement accuracy with battery indicator, alarm value setting, adjustable volume. Specification: Item Type: Oxygen Detector Material: ABS Model: AR8100 Battery: Lithium battery 3.7V 1000mAh (built in battery) Uses: Widely used in factories, homes, offices and public places. Support Language: English Alarm: Audio and light Working Time:> 90h Working Temperature: -10-50℃ Measuring Range: 0~30% Resolution: 0.1% Accuracy: <1.5%FS Response Time: <15 seconds Recovery Time: <15s Sample Mode: Electrochemical principle. Package List: 1 x Oxygen Detector1 x USB Cable1 x Manual Note: The influence of oxygen deficient and oxygen enriched ambienceOxygen concentration (%) Symptoms (atmospheric pressure)100% fatal, 6 minutes (absolutely closed environment, such as hyperbaric oxygen chamber)50% is fatal and can be cured after 45 minutes of treatment. (Absolutely closed environment, such as hyperbaric oxygen chamber)>23.5% oxygen enriched20.96% normal19.5% minimum15~19% reduces efficiency, causing problems in the head, lungs and circulatory system10~12% Shortness of breath, loss of judgment, purple lips8~10% treatment failed, syncope, coma, pale face, nausea and vomiting6~8% 8 minutes, low blood pressure, rapid heartbeat, mouth breathing, stop breathing quickly4~6% 40 seconds, convulsions, respiratory arrest, death