3 Stunden und die letzte Stunde gibt der Kopfhörer jede 10-60 Sekunden (Zufall?) 3 Pip Geräusche von sich, die wohl anzeigen sollen, dass die Batterie geladen werden soll. We wanted to check everything out before setting everything up for her, and we found these were made well, had good sound volume and quality, were comfortable for a decent length of time, and overall were good headphones. By doing this, I have two hooks that will not move. My daughter wore twice, stitching at seams already coming apart. Aber was kosten schon ein paar weiße Schnürsenkel. Ive been very impressed by their sound quality. Button cap alternatives are welcome & helpful. Also, these may not slip in standard environments but in a busy kitchen they slip. These have untied on me twice mid-run and simply can?t be used without being tightly double knotted. Just remember, if you leave it on, it stays on.