This model is equipped with a Bluetooth module, enabling music files to be transferred via its A2DP profile from many different mobile devices, such as smartphones or laptops. This allows you to listen to your favourite songs stored in your own music library or available on public websites for 3-4 hours. The TWS function makes it possible to obtain stereo sound comparable to that of the best audio equipment. All it takes is to connect two BT05BL/BK speakers to each other via Bluetooth, pair them with one smartphone and set up at two opposite ends of the desk. BT05BK has also a built-in FM tuner with 60 preset radio stations, so there is no need to search the entire frequency range in order to find your favorite radio station. Under the rubber cover is a microSD card port for reading audio files stored on a portable data carrier (max. 32GB). AUX-IN connector gives possibility to connect any other devices that play your favorite music. Built-in amplifier has 2Watt output power.