Feature:1. Measurement Range: The portable oxygen detector has a measuring range of 030%vol and a sensitive response.2. Multifunctional: Fully functional, triple alarm, lasting standby, splashproof, dust proof, explosion proof.3. 1.7 Inch Backlit LED Display: The portable oxygen detector features a 1.7 inch backlit HD LED display for easy reading.4. Metal Back Clamp: Adopt metal back clamp, close tightly, prevent falling off, strong and durable.5. Portable Compact: Compact size, light weight, portable, wide application range, can be used for home, office.Specification:.Item Type: Oxygen DetectorMaterial: ABSMeasuring Object: OxygenIndication Mode: Sound, Light and VibrationWorking Environment: Temperature -10 to 55; Humidity<95%Rh (non Condensing)Accuracy: 5% F. SCharging Time: 4-6 HoursStandby Time: More Than 8h ContinuousMeasuring Range: 0-30%volResolution: 0.1% VolAlarm Point: Low 19.5%, High 23.5% VolPower Supply: USB 5VProduct Size Without Back Clip: Approx. 11 x 6 x 3cm / 4.3 x 2.4 x 1.2inBattery: 803450 Polymer Battery, 1500mah (shipped with Built in Battery)Weight: Approx. 820g / 28.9ozPackage List:1 x Host 1 x Storage Box1 x Usb Cable1 x User Manual 1 x Accessories 1 x Storage Rope