... We sell from manufacturer directly. PG610-O2 oxygen gas detector shell is nonskid, waterproof, dustproof and explosion-proof.Main ... oscillator speed of 1300 r/minWorking VoltageDC3.6 V lithium ion battery, 1000 mAhCharging Time4 h ~ 6 hWorking Timemore ... mm × 60 mm × 24 mmStandard configuration: instrument box, gas detector, specifications, certificate of approval, warranty card, charger, gas hood ...