Product Name: Air Quality Tester (CO Carbon Monoxide) Sensor type: electrochemical sensor Detection range: 0-1000ppm ± 10% ppm Resolution: 1ppm Working environment: -10~50 ° C; Humidity ≤ 95% RH without condensation Temperature measurement range: -10-50 ℃ Temperature measurement error: ± 1 ℃ Humidity measurement range: 0% -99% RH Humidity measurement error: ± 5RH Battery capacity: 800mah Battery life: Approximately 18 hours on screen and 40 hours off screen Charging time: approximately 1 hour Charging method: USB type c Product size: 16 x 35 x 105MM Screen size: 0.96 inch TFT color screen Material: plastic colour: black Package Contents: 1 x PPM Detector 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.