1、Large Capacity Rechargeable Battery: The CO2 detector has a built in large capacity rechargeable battery. You can check the air quality from anywhere, or have the device continuously monitor at a specific location. 2、Easy to Carry: The air quality monitor is small and portable, easy to carry as a decoration, you can check the air quality anytime, anywhere. Intelligent early warning system, excellent infrared non destructive detection sensor, prevent multiple disturbances. 3、Full Color LCD Screen: With full color display and LCD screen design, this carbon dioxide detector is super easy to read. Digital display with intelligent backlight, eye protection function, one key operation. 4、Accurate Measurement: The carbon dioxide monitor adopts excellent sensor with high measurement accuracy, which can accurately detect the concentration of carbon dioxide in the air with a measurement range of 0 to 9999PPM. 5、Wide Application: CO2 detector is suitable for home, school, office, travel, indoor, outdoor, agricultural planting, production warehouse, and other scenarios. Item Type: CO2 Detector Material: ABS Model: HT 501 Power Supply: 1 x 3.7V lithium battery(1200mah) (shipped with built in battery) Recording Mode: Manual measurement Instant Measurement Response Time: 1 second Record Storage: 12700 Carbon Dioxide Measurement Range: 0 to 9999PPM Accuracy: ±70ppm ±3% reading (0 to 5000) Resolution: 1PPM Temperature Measurement Range: -10 to 70℃ (14 to 158°F) Resolution: 0.1℃/°F Temperature Measurement Accuracy: ±1℃ Humidity Measurement Range: 0% RH to 99.9% RH Accuracy: ± 3% (10 to 90%) Resolution: 0.1% Working Conditions: 0 to 50℃, 0 to 85% RH (non condensing) Storage Conditions: -20 to 60℃, 0 to 90% relative humidity (non condensing) 1 x CO2 Detector 1 x Instruction Manual 1 x Plug 1 x USB Cable