Feature: 1. High Sensitivity: Using electrochemical sensors, with good sensitivity and excellent repeatability, short response time, accurate and professional measurement. 2. LCD Screen: It is equipped with a high definition backlight LCD screen, supports dual screen display, and clearly displays carbon dioxide concentration, temperature and humidity. 3. High Accuracy: It is specially used to detect the concentration of carbon dioxide, the measuring range is 350‑9999PPM, high accuracy, small error, stable and reliable. 4. Special Function: High and low alarm value can be set, with sound and light dual alarm prompt, adjustable alarm value, alarm sound up to 80dB, prompt reminder and early warning. 5. Portable Design: Handheld CO2 gas detector, small size and lightweight, easy to carry, suitable for industrial, agricultural and residential environments and other places. Specification: Item Type: CO2 Monitor Material: ABS Model: AR8200 Battery: Lithium Battery 3.7V 1800mAh (Built In) Purpose: This instrument is a special instrument for detecting carbon dioxide concentration. It adopts electrochemical sensor, which is sensitive, can set high and low alarm values, and has sound and light alarm prompts. It is suitable for industrial, agricultural and residential environments. Support Language: English Basic Parameters: LCD Screen or Not: Yes Gas Type: Carbon Dioxide (CO2) Measuring Range: 350-9999PPM Resolution: 5PPM Basic Error: ±(30PPM + 5%rdg) Alarm: Sound and light alarm, adjustable alarm value, alarm sound up to 80dB. Package List: 1 x CO2 Monitor 1 x USB Cable1 x Manual 1 x Storage Case Note: Do not be surrounded by such gas for a long time, which may cause suffocation and cause safety accidents.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.