Description Note: When manually calibrating, the device must be placed in an open, ventilated, and unoccupied environment. Otherwise, an incorrectly calibrated base number will result in incorrect measurements. Main Features Superior infrared NDIR sensor with high precision, strong anti-interference, and excellent stability CO2 indicator light and high-level alarm, dual alarm function to protect family health Full-color LCD display with energy-saving ECO mode, easy-to-read and eye-caring Portable size with a lanyard, easy to carry anywhere 1000mAh rechargeable lithium battery, 72-hour long-lasting battery life Support automatic calibration function, always provide accurate measurement Specifications Model: PTH-10C Color: Metallic Gray Material: ABS Shell Carbon Dioxide: 400~5000 ppm [±(50ppm+5%)] CO2 Sound Alarm Range: (default) 1500 ppm Battery: Built-in lithium-ion polymer battery (3.7V, 1000mAh) Input: Type-C, DC 5V ~ DC 24V (Max) Fast Charging Protocol: QC2.0, PD3.0, AFC, USB C UFP (BC1.2 DCP CDP SDP) and other common fast-charging protocols Storage Temperature: -10? ~ 55? / 14°F ~ 131°F Product Size: 76mm×70mm×30mm (2.99 in×2.75 in×1.18 in) Package Contents 1x CO2 Detector 1x Lanyard 1x Charging Cable 1x User Manual