Wireless connection frees you from a twisted or kinked cable. Up to 10 meters operation range, no need to worry about the disconnection while you are on a move. This headset is like an MP3 player. You can insert the music card in the headset and listen to all the music you want. If the headset runs out of power or you have to connect it to a device with no Bluetooth connection, you can connect them with a 3.5 mm audio cable. This is a very convenient and thoughtful design. Built-in high-quality audio coded, giving you excellent voice experience, Ergonomic design make these headsets comfortable for long time wearing. The foldable design makes it easy to carry with. This headphone has more functions than you can imagine, like Radio Function, with a built-in radio antenna and a radio set, this headset is like a radio.