1. Industrial-grade sensor, high precision, real data, strong stability, real-time detection. 2. Triple alarm mode (sound, light, vibration) is not easy to ignore, high security, high and low alarm value can be set free 3.3.7v rechargeable lithium battery, battery capacity 1500MA, charging time is less than five hours, continuous work for more than ten hours (gas detection is not less than 7 hours) 4. High-strength ABS material, waterproof, dustproof, explosion-proof, three anti-design 5. The use of mainstream 8-bit micro-control technology, fast response, high precision, stability and repeatability, simple operation, small size, portable and durable, with a high degree of waterproof performance, withstand the harsh environment of the test Product description: Gas type: O2 Gas detector Gas measurement range: 0-30%VOL Resolution: 1%VOL 3 Alarm methods : Sound Alarm, Light flashing, Vibrating alert, adjustable alarm values, alarm sound up to 80db Operating temperature: -2050(except LEL is 0~40C) Operating humidity:95%RH (no dew) Display: 2.0 inch HD display Power: 3.7V li-battery(Built-in) Battery runtime: 10 hours or so. Product Net Weight : 227g (with battery) Size : 100mm60mm30mm (L W H) Explosion-proof mark: Exib IIB T3 Gb Protection class: ip65 Record storage: 1000 groups of alarm records Product Size: 130mm67mm30mm (L W H) Package Weight: 1000g