Feature: 1. [Large Screen] The large screen displays the battery level, which is clear and easy to read, and the measurement results are accurate. 2. [Multifunctional] Using empty semiconductor TVOC sensor, which can measure CO2, temperature and humidity, to meet your various need. 3. [Good Heat Dissipation] Enough ventilation holes accelerate the convection between the air and the machine and provide a good heat dissipation effect. 4. [Durable Material] Made of high quality plastic and glass materials, which is safe, durable, wear resistant, and can be used for a long time. 5. [Widely Application] Carbon dioxide detector is widely used in a variety of situations, such as offices, bedrooms, living rooms, gymnasiums, etc. Specification: Item Type: Air Quality Detector Product Size: Approx. 9 x 7 x 3.5 cm / 3.5 x 2.8 x 1.4 in Material: Plastic + glass Response Time: <1s Test Temperature Range: 0℃ to 50℃ Humidity Test Range: 0-99%RH CO2 Detection Range: 400-5000PPM Working Voltage: 5V Maximum Power Charging Current: 600mA Battery Type: Lithium battery (Battery Included) Battery Capacity: 1200mAh Charging Time: 1 hour Charging Method: USB charging Application: Homes, restaurants, educational institutions, fitness clubs Weight: Approx. 180g / 6.3oz . Package List: 1 x Air Quality Detector (Battery Included)1 x Manual1 x USB Charging Cable Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.