What's in the box:

Handheld Digital Oxygen Detector USB Rechargeable Automotive O2 Sensor Tester Monitor LCD Display Adjustable Alarm Auto Power Off Oxygen Meter for Car Tunnel Laboratory and Industry (Standard)

The intelligent precise oxygen detector use electri-chemical type gas sensor to measure the gas, can quickly response to oxygen gas, sound and light alarm level can be set manually. Great tool for home, agriculture, chemmical industry, general industries.

Features:
PROFESSIONAL OXYGEN DETECTOR -- Portable oxygen(O2) gas detector, measure range 0-25% oxygen content. Adopt electri-chemical type gas sensor to measure, this oxygen detector sensor with stable performance and high accuracy.
ADJUSTABLE ALARM -- Sound and light dual-alarm when O2 gas concentration reaches the level of the alarm. And the alarm value can be customized according to users demands.
BACKLIT LCD DISPLAY -- The gas meter is compact and lightweight, features a large LCD display with backlight, you can get the result from the screen at a glance, even in dark,easy to carry on and convenient for reading.
USB RECHARGEABLE -- Come with a 3.7V rechargeable lithium battery, charging through micro USB interface, which can be powered by power adapter, power bank, etc..
WIDELY APPLICABLE -- The Oxygen detectorCs can be used in metallurgy, power plant, chemical, mine, tunnel, underground pipelines and other places, effective prevention of hypoxia and oxygen poisoning.

Speicification:
Color: Black + Blue
Material: ABS
Detecting Gas: Oxygen
Voltage: AC100-240V, 50/60Hz
Output: DC5V, 100050mA
Measuring Range: 0~25%
Resolution: 0.1%
Basic Error: 5% full scale
Temperature: -10~50?
Resolution: 0.1?
Working Humidity: 1%RH~99%RH
Response Time: 15S
Recovery Time: 15S
Alarm Mode: Acoustic and Light
Auto Power Off: Mannual Selectable (10 mins no any key press down)
Power Supply: 1 * 3.7V, 1000mAh rechargeable li-ion battery
Screen Size: 4.4 * 5.3cm / 1.73 * 2.08in
Item Size: 180*65*30mm / 7.09*2.56*1.18in
Item Weight: 182g/6.42in

Packing List:
1 * Smart Oxygen Detector
1 * USB Cable
1 * User Manual
1 * Carry Bag