3 In 1 CO Air Quality Monitor 1000mAh CO Detector Alarm Temp Humidity Sensor CO Temperature Humidity Detector for Indoor Outdoor. Features: Comprehensive Detection, Compact and Convenient, Long-Lasting Battery, Customizable Alerts, Versatile Application. Specification: Origin: Mainland China, Material: ABS, Electronic Components, Color: Dark Gray, Size: 6.8cm/2.68in*6.8cm/2.68in, Co Resolution: 1ppm, Co Measurement Range: 0-500 Ppm (±10%), Co Over-Limit Alarm: (Initial Default Value) 50 Ppm, Temperature: 0℃~50℃ (±1.5℃)/32℉~122℉ (±2.7℉), Humidity: 0%~95%Rh (±5%Rh), Battery: Built-In Lithium-Ion Polymer Battery (3.7v, 1000mah), Charging Time: 1h, Battery Life: 120h, Input: Type-C, DC 5V/500mAh, Storage Temperature: -20°C~55°C/14°F~158°F