Features: 3 IN 1: This CO2 monitor can detect real-time CO2 concentration, monitor indoor and outdoor humidity, and temperature. Mini Portable: Small and portable, easy to carry, you can check air quality anywhere and anytime. With Intelligent early warning system, infrared NDIR sensor, multiple interference prevention. Capacity: High-capacity polymer battery lasts for a long time. High-performance battery 603040, 700mAh high-capacity polymer lithium battery, which is safe, durable and has a long battery life. Design: Ultra High-Definition color screen, equipped with high-precision sensors, real-time monitoring of CO2 concentration, making the air quality more intuitive. Supports USB charging and power indicator. The back heat dissipation design can not only that the sensor is in full contact with the air, also facilitate heat dissipation. Wide Range of Applications: Widely used in indoor and outdoor , indoor wall cabinets, kitchens, restaurants, , homes. Specifications: Item name: Mini CO2 Concentration Detector Sensor: NDIR Display mode: 1.9in ultra-high-definition color screen. Green: Safe, no alarm sound; Yellow: Didi sound alarm, 10 minutes. Resolution: 240*280 Preparation time: About 35 seconds Data refresh frequency: 2 seconds 3 in 1: CO2 concentration/Temperature/Humidity detection CO2 detection range: 400 to 5000PPM(50PPM) Temperature range: -10 to 50/ 14F to 122 F Humidity detection range: 0-95%RH Battery capacity: 700HMA, with power indicator Battery model: 603040 Charging interface: TYPE-C 3.7V Use time: About 18 hours Item size: . 85 x 50.6 x 17mm Material: ABS+PC colour: White Package Contents: 1 x CO2 Concentration Detector 1 x USB charging cable 1 x English manual 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.