I ordered replacement headphones because the headband I'd been using every night for years finally started losing battery power and would wake me up too early, saying "low battery, please charge" at top volume in my ear (it wasn't a Dormi headband). These new Dormi headphones charge quickly, stay charged far longer than I need them, connect quickly and easily to my phone, and the large speakers are much more comfortable than other sleep-phone headbands I've used in the past. It also fits my old headband from another brand (not perfectly, but it works). Highly recommend!