Features: 1. A high-accuracy sensor is adopted in the detector. It works quickly, stably, and won't be affected by temperature or other conditions than outdated Chemosensor. 2. Measuring range: CO2: 400-5000PPM; HCHO: 0-1.712mg/m³; TVOC: 0-12.50mg/m³; Temperature range: -20 ℃ - 60 ℃; Humidity range: 20-99%.3. A portable detector the size of a palm, is easy to carry and can detect the gas quality in bedroom, living room, kitchen, office, car, school, hotel, campground and other environments.4. Multifunctional Carbon Dioxide Tester: This product can detect your indoor carbon dioxide, but also display the air humidity and temperature.Specifications: Size: 118x70x34MMWeight: 226gColor: BlackBattery: 1200MA 3.7V Package Included: 1 x Carbon Dioxide Detector 1 x Manual 1 x Data Cable