Feature: 1. 3-in-1: This carbon monoxide detectors equipped with 3 major air indicators of CO2 concentration(0~9999PPM), temperature(-29℃ to 70℃/-20℉ to 158℉), and humidity(0% to 100%RH) to protect your family. 2. Compact Design & Clear LCD Display: Portable carbon dioxide meter is small and light, can be carry to anywhere easily, 3.5" TFT-LCD with color display, the high-definition screen makes it easy to read even at night. 3. Dual Installation Methods: Device design with hanging holes and a foldable bracket, conveniently for hanging it on the wall or just place it on the countertop. 4. Multi-Functions: Also have a perpetual calendar and time display, maximum and minimum display, low battery indicator, data logging and automatic power off function. 5. Widely Used: Carbon dioxide meter are suitable for bedroom, kitchen, living room, bathroom, apartment, garage, office, restaurant, hotel, RV etc. Specification: Specifications: Color: White / Orange (Optional) Model: TL-2000E Material: ABS Carbon Dioxide Range: 0~9999PPM(out of scale) Accuracy: ±50ppm ±5%rdg (0~5000) Resolution Ratio of Carton Dioxide Concentration: 1PPM Temperature Measurement Range: -29℃ to 70℃ (-20℉ to 158℉) Temperature Measurement Accuracy: 1℃ Temperature Resolution: 0.01℃/℉ Humidity Measurement Range: 0 to 100%RH Humidity Measurement Accuracy: ±3%RH Humidity Resolution: 0.01%RH Power Supply: Built in with demountable 3.7V/18650 cylinder battery or externally connected 5V USB power Working Current: 90mA-300mA Battery Service Life: 2600mAh capable of continuous work at >15 hours Auto Power Off: Apable of being set (default as"no shut down") Record Groups: 6000 groups Working Temperature Range: -10℃~+60℃ (-4℉~+140℉) Working Humidity Range: 0-99%RH Storage Temperature Range: -40℃~+ 80℃ Item Size: 138 * 100 * 36mm / 5.43 * 3.93 * 1.41in Item Weight: 250g / 8.81oz Package Weight: 800g / 28.21oz Package Size: 27 * 22.5 * 7.7cm / 10.63 * 8.85 * 3.03in Package List: Package List: 1 * Carbon Dioxide Meter 1 * USB Cable 1 * CD 1 * User Manual (English)