We re-write the mode to a power-saved design. the CO detect's screen backlight will turn off if there is no operation after 1 minute, but the CO detector the carbon monoxide, humidity, termp in 2 seconds. Pls don't worry about it. If the CO detector is in low power, the alarm will sound ""di"" per 1 minute. This new poer-saved mode helps to increase the continue working time to 60 hours with full power. 

About 4-5 hours I got bit just keep it plugged in in my camper when camping 

Yes …. You can use anywhere it goes with you… I use mine in our camper 

This carbon monoxide detector is portable design with a lanyard. It is convenient to hang it to a school backpack. It is perfect for school life, a safety air environment is so important to children. 

Yes believe holding the bottom right button will do 

Our detector is built-in 1000 mAh lithium battery.