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: 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. 1 x Host 1 x Storage Box 1 x USB Cable1 x Instruction1 x Accessory1 x Storage Rope Item Type: Handheld Nitric Oxide Gas DetectorMaterial: ABSGross Weight: 820g / 28.9ozMeasurement Object: nitric oxideIndication Mode: sound, light and vibrationWorking Environment: temperature: - 10°C~+55°C; Humidity:<95% RH (non condensing)Accuracy: ≤± 5% F.SCharging Time: 4-6HStandby Time: more than 8H continuousMeasuring Range: 0-250PPMResolution: 1PPMAlarm Point: low 50, high 150 PPMPower Supply: USB 5VProduct Size without Back Clip: Approx.11 x 6 x 3cm / 4.3 x 2.4 x 1.2inBattery (shipped with built in battery): Model 803450, polymer battery, 1500MAH