The portable 4-in-1 CO/CO2 detector can monitor the current CO/CO2 concentration, temperature and humidity in the air in real time.Equipped with high-precision sensors, the detectable CO2 concentration range is 0~1500~PPM, the temperature range is 32~122(2.7)/0~50(1.5), and the humidity range is 20~80%RH (5 %RH). The Carbon dioxide alarm can display 3-level light indications according to the Carbon dioxide concentration in the air. 400~699ppm (green area flashing = safe), 700~1499ppm (yellow area flashing = warning), 1500ppm~X (red area flashing = danger). By default, the CO2 alarm will sound an alarm when it reaches 50PPM. Equipped with high-precision sensors, the detectable carbon monoxide concentration range is 0~500PPM, the temperature range is 32~122(2.7)/0~50(1.5), and the humidity range is 20~80%RH (5 %RH). The carbon monoxide alarm can display 3-level light indications according to the CO concentration in the air. 0~49ppm (green area flashing = safe), 50~99ppm (yellow area flashing = warning), 100~500ppm (red area flashing = danger). By default, the CO alarm will sound an alarm when it reaches 50PPM. Built-in 1000mAh lithium battery, durable power supply. Support QC2.0, PD3.0, , USB C UFP (BC1.2 DCP ) and other common fast charging protocols 10~65W charging Equipped with a special outdoor lanyard, it is easy to carry, suitable for outdoor activities such as travel, camping, picnic, and adventure. There is also a magnetic feature on the back of the CO/CO2 monitor, allowing it to be attached to metal areas such as appliances or cars. size: 7.6 x 7.6 x 3cm Material: ABS colour: As Shown Package Contents: 1 x Detector 1 x English instructions 1 x lanyard 1 x data cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.