From this video, You can make your earphones or headphones wireless.
Wireless headphones work by connecting, or pairing, with the device you want to use, through radio or infrared signal. So when Bluetooth enabled product, such as a smartphone and headphones, are in close proximity to each other, they connect, or pair.
Therefore you can make your earphones or headphones using a Bluetooth module.

How to make wireless sport earphones at home.