Product Name: XO-2200 Model: XO-2200 Features: Ultra-small object detection: Oxygen detection methods: Diffusion Features: 1, with one on the 7th battery can be used continuously for 5,000 hours. 2, so that jobs are easy to find with a large volume, four directions warning light, vibration function. 3, equipped with a peak storage function? Peak hold function. Thickness of 4,22 mm, and weighs about 75g, compact and lightweight. 5, the sensor can operate in exchanging hands. Specifications: Model: XO-2200 detects objects gases: oxygen detection principle: divide the current battery type, gas acquisition mode, diffusion measurement range: 0 ~ 25.0vol% (25 ~ 50.0vol%) alarm settings concentration (standard setting ): 1 Section Head: 19.5vol% 2 Section Head: 18.0vol% Response time: Within 20 seconds Display: LCD digital (automatic background light) Alarm: the buzzer sounds, the red light flashes, LCD, vibration (automatic Normalized duplex) Power: 1 AAA alkaline batteries Operating temperature range: -10 ℃ ~ 40 ℃, 30 ~ 90% RH or less (but no condensation) proof construction: intrinsically safe construction (Exib Ⅱ BT3) Size: W65 × H64 × D22mm (excluding protrusions) Weight: Approx 75g (including battery) subsidiary functions: battery residual quantity display, peak hold function, peak storage function, alarm function outside the gas alarm function (sensor error, remaining battery capacity, 21% of poor adjustment ) Standard accessories: No. 7 alkaline batteries a safety knot is a turn buckle (with installation screws) Optional: leather, heat leather jacket, belt clip buckle rope, helmet jacket, filters