Up to 100 hours of playtime: You can use the Bluetooth headphones for 40 days when you use them for 3 hours A day or travel with the headphones for a month without charging Deep bass function: The wireless headphones with 40mm large-aperture drivers and Deep bass function deliver premium playback with superb bass depth and HD clarity Lose wired：Lastest Bluetooth technology ensures easy and stable connectivity and seamless Audio/video syncs so that you can take calls and listen to music without worrying about Audio dropouts Unparalleled comfort: Comfortable ear cups are soft durable and built for all-day listening Soft-cushion ear pads made from synthetic protein leather provide a comfortable around-ear fit Folding design: Headphones over-ear can be folded into a compact size and stored in the portable carry bag so that you can take music with you wherever you go 28