Features: 3 IN 1: This CO2 monitor detects real-time CO2 concentration, monitors indoor and outdoor humidity, and temperature. Mini Portable: Small and portable, easy to carry, allowing you to check air quality anywhere and anytime. Features an intelligent early warning system, infrared NDIR sensor, and multiple interference prevention. Capacity: High-capacity polymer battery provides long-lasting performance. Equipped with a high-performance 603040, 700mAh polymer lithium battery that is safe, durable, and offers extended battery life. Design: Ultra-high-definition color screen with high-precision sensors for real-time monitoring of CO2 concentration, making air quality easy to understand. Supports USB charging and includes a power indicator. The back heat dissipation design ensures full sensor contact with air and efficient heat dissipation. Wide Range of Applications: Suitable for indoor and outdoor use in wall cabinets, kitchens, restaurants, and homes. Specifications: Item name: Mini CO2 Concentration Detector Sensor: NDIR Display mode: 1.9-inch ultra-high-definition color screen. Green: Safe, no alarm sound; Yellow: Alarm sound, 10 minutes Resolution: 240x280 Warm-up time: Approximately 35 seconds Data refresh frequency: 2 seconds 3 in 1: CO2 concentration/Temperature/Humidity detection CO2 detection range: 400 to 5000 PPM (accuracy 50 PPM) Temperature range: -10C to 50C (14F to 122F) Humidity detection range: 0-95% RH Battery capacity: 700mAh, with power indicator Battery model: 603040 Charging interface: TYPE-C 3.7V Usage time: Approximately 18 hours Item size: 85 x 50.6 x 17mm Material: ABS+PC Color: White Package Contents: 1 x CO2 Concentration Detector 1 x USB charging cable 1 x English manual Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.