Krisons 4.1 has various input sources like bluetooth, USB ,Fm radio , AUX-in and sd card reader and is compatible with your mobile phone, tablets, PCs, televison etc. It comes with 1 sub-woofer and 4 satellite speakers. It has a wieless remote for ease of use. It has a high output and cystal clear natural sound. It is a perfect home entertainment audio sytem with state of art technology and european design for those who prefer true value, attractive looks and superior performance this is the right choice. Just plug-in and enjoy.