Choose a design based on where you would like to wear your headphones. Ear buds fit inside your ear, while over the ear headphones wrap around the outside of your ears. Behind the head headphones fit into your ears and rest below the back of your head. Over the head headphones are standard.
High quality stereo music playback, Support bluetooth V2.1+EDR, Extra compact design, Special multi-function button design for easy operation, 6 to 8 hours playback time
The sound mode describes what kind of output your headphones are capable of. Mono is a single channel of sound, while stereo is two, which allows your ears to hear different things. Surround sound has five channels of sound, which gives a better impression of being in the center of a complete sound system.