Must be connected. Utilizing the battery choice of 4 AAA batteries (Energizer mark) it began to diminish the primary hour digit, first moment digit, first dampness digit, the R/H image, and second temp digit after just 6 days. No cautions were set, and yes I think about the auto darkening element as it changes from am to pm. It isn't so much that. When I connected it to the power connector it had returned to full splendor for the entire presentation. What sucks is the usb string gave is just 3 feet so plan on stopping this privilege alongside an outlet. Did I notice the usb control block it connects to has one of the most brilliant red LED's known to man introduced on it to advise you it is fueled? I cherish the look and show of the clock however detest I can't put it precisely where I need without requiring a week after week battery swap.
I got this clock to supplant an old wake up timer. This is so pleasant and simple on the eyes. Looks astounding. I adore it.