This is a no frills Bluetooth earphone set. Sound is ok, bass is mushy but does go low. Volume is not loud enough sometimes, even on max. Very light and fit securely for sports. Not sound isolating, so at the gym it doesn't block the dance music (the reason it was bought, so I'm back to my Shure SE215s). But very very cheap. Battery life is only 2-3 hours on max volume.