As per technological enhancement, many up-gradation had been made to improve audio quality. But most of them are using wire connections with your phone, tablets, mp3 players, or i-pods. Many of us are using headphones or earphones which need a wire to connect with our device.
In the next phase of development Bluetooth headphones and earphones are also introduced in the market. It has wireless connectivity but these are having a wire to make the connection with their Bluetooth circuitry and battery. This physical layout makes it less impressive.