1. Lithium battery direct charge, durable 2. Full-color screen, safe and stable 3. High precision and fast detection 4. Widely used and easy to operate CO2 detection range: 400-5000ppm CO2 detection sensitivity: 1ppm TVOC detection range: 0-2ppm Temperature measurement range: 0-50C Temperature measurement accuracy: 1C Humidity measurement range: 0-99%RH Humidity measurement accuracy: +2%RH USB DC5V Type C Power supply: DC 3V or AAA 1.5Vx2PC (not include) Material: plastic colour: black+white Package Contents: 1 x CO2 Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.