Feature: 1. Sensitive Response: This nitric oxide gas detector adopts triple alarm, durable standby, sensitive response, excellent performance, and can be used at ease. 2. LED Screen Display: 1.7 inches backlight high definition LED screen display, real time display of monitoring data, clear at a glance, real time alarm. 3. Splashing Proof: This USB gas detector has complete functions, such as splashing proof, dustproof, explosion proof, safe use and long service life. 4. Metal Back Clip: Adopts metal back clip, which is tightly fastened to prevent falling off and can be firmly fixed for use. 5. Portable: Small size, compact and delicate, the handheld alarm is convenient, can be carried at any time without burden, and is easy to use. Specification: Item Type: Handheld Nitric Oxide Gas Detector Material: ABS Gross Weight: 820g / 28.9oz Measurement Object: nitric oxide Indication Mode: sound, light and vibration Working Environment: temperature: - 10°C~+55°C; Humidity:<95% RH (non condensing) Accuracy: ≤± 5% F.S Charging Time: 4-6H Standby Time: more than 8H continuous Measuring Range: 0-250PPM Resolution: 1PPM Alarm Point: low 50, high 150 PPM Power Supply: USB 5V Product Size without Back Clip: Approx.11 x 6 x 3cm / 4.3 x 2.4 x 1.2in Battery (shipped with built in battery): Model 803450, polymer battery, 1500MAH. Package List: 1 x Host 1 x Storage Box 1 x USB Cable1 x Instruction1 x Accessory1 x Storage Rope