Features: 1.This oxygen detector with high accuracy, fast response and stable performance. 2.Portable oxygen (O2) gas detector, measuring range 0-25% oxygen content. Adopts electrochemical type gas sensor for measurement with high accuracy. 3. When the oxygen concentration reaches the alarm level, sound and light double alarm. And the alarm value can be customized according to user's needs. 4. Compact and lightweight, with a large LCD display with backlight, even in the dark, you can get the results from the screen at a glance, easy to carry and easy to read. 5. The detector can be used in metallurgy, power plants, chemical industry, mines, tunnels, underground pipelines and other places to effectively prevent hypoxia and oxygen poisoning. Specification: Material: ABS Detecting gas: oxygen Measuring range: 0~25% Resolution: 0.1% Basic Error: ≤±5% Temperature: -10~50℃ Resolution: 0.1℃ Working humidity: 1%RH~99%RH Response time: ≤ 15S Recovery time: ≤ 15S Alarm mode: sound and light Automatic shutdown: manual optional (no key pressed within 10 minutes) Power supply mode: USB Battery capacity: 1000mAh Product size: as shown in the picture Package size: 25*20*6cm Weight: 750g Package Includes: 1 * Intelligent Oxygen Detector 1 * USB cable 1 * User manual