Bluetooth technology enables wireless file transmission between two compatible devices. To synchronize them for the first time, you must enter the information for each device on the other device, although this will not be necessary to connect them a second time. This technology was born in 1994 and today there are several compatible versions between them. Version 5 has been available since the end of 2016 and is the most used by the latest headphones that have appeared on the market. It offers twice the transfer capacity of versions 4.1 and 4.2 and a wide range of connectivity.