Feature: 1. Measurement Range: The portable oxygen detector has a measuring range of 0‑30%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 Detector Material: ABS Measuring Object: Oxygen Indication Mode: Sound, Light and Vibration Working Environment: Temperature -10℃ to 55℃; Humidity<95%Rh (non Condensing) Accuracy: ≤± 5% F. S Charging Time: 4-6 Hours Standby Time: More Than 8h Continuous Measuring Range: 0-30%vol Resolution: 0.1% Vol Alarm Point: Low 19.5%, High 23.5% Vol Power Supply: USB 5V Product Size Without Back Clip: Approx. 11 x 6 x 3cm / 4.3 x 2.4 x 1.2in Battery: 803450 Polymer Battery, 1500mah (shipped with Built in Battery) Weight: Approx. 820g / 28.9oz Package List: 1 x Host 1 x Storage Box1 x Usb Cable1 x User Manual 1 x Accessories 1 x Storage Rope