Features: brand new and high quality 3-IN-1 CO-2 DETECTOR. This carbon dioxide detector uses the NDIR CO-2 sensor, with a highly readable 2.8 Inch 240 x 240 resolution LCD-screen display, accurately moniting indoor air ventilation levels with CO-2 ppm levels, temperature and humidity in real for time. HIGH PRECISION CO-2 SENSOR. Indoor air quality monitor, high measurement accuracy, fast response. Assess the quality of your air and help keep air-fresh in any indoor space with this CO-2 detector. DETECTION RANGE. Carbon Dioxide Detection Range: 400-5000 ppm; Humidity Range: 0-99%. When CO-2 PPM exceeds 1500, the alarms will sound out. RECHARGEABLE BATTERY. Built-in 1200-mAh rechargeable lithium battery, support 2 hours fast charging. WIDE APPLICATIONS. This 3-in-1 CO-2 monitor is suitable for home bedroom, living room, baby-room, kitchen, office, meeting room, school, green-house, and for cars. Specifications: Color: Black; White Screen Size 2.8 Inch Screen Resolution: 240X240 Carbon Dioxide Detection Range: 400-5000 ppm Carbon Dioxide Exceeded Alarm Value: 1500ppm Battery Capacity: 1200-mAh Lithium Battery Size: Approx. 90x70x35mm/3.54x2.75x1.37in Material: PC+ ABS + Glass Weight: Approx. 195g Package Includes: 1 X 3-IN-1 CO-2 Detector 1 X USB Cable 1 X User Manual note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!