Carbon Dioxide Detector - Good accessory for your smart home!Features: In alarm mode, the user is prompted to pay attention to the environment by changing the color. It has long service life and can be charged with USB cable. It is small and portable, easy to carry, does not occupy too much space, and can be installed at home.Specifications: Material: ABS Plastic, MetalMeasurement accuracy: 1ppm Measuring range: 400-6000 Working voltage: 3.7V Current: 120mA Power: 0.4W Battery: 3.7V, 1500mah, shipped without 18650 lithium battery, optional, with battery plus 3 yuan. 18650 lithium battery can be disassembled. Item size: 89 * 70 * 35mm /3.52.761.38 inchesPacking list: 1 * CO2 detector 1 * USB cable 1 * ManualPromise: If the product has any quality problems, please feel free to contact us, we will help you solve the problem as quickly as possible.