Features 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 Detector 1 x USB Cable 1 x Manual