| Features: 2.8-inch large screen simultaneously display the current CO2 concentration, temperature, humidity and battery indicator. 1s automatic refresh detection data, real-time monitoring, stable and reliable. 4pcs color light bar(green, yellow, orange, and red) indicate for the corresponding CO2 concentration. One button control, short press to switch the temperature unit between celsius and Fahrenheit , long press to ON/OFF the detector. Built in with 1200mAh rechargeable lithium battery, no need to change battery, economical and environment-friendly. Compact portable size with simple modern appearance, suitable for home, office, dormitory, warehouse, etc. Specifications: Color: Black | |