Boss Audio - Systems - MP3,CD,AM/FM,USB,SD,BT-SILVER - MR508UABS. Weather Proof 50 Watts x 4 Max Power, Balance/Fader/Bass/Treble and Preset built-in EQ. Plays USB/SD, MP3, WMA, FM/AM and Smart Phones. Compatible with Audio out from Smartphones and MP3 Players. USB, SD, Aux, Inputs. Front & Rear Pre Amp Outputs. Wireless Remote. Bluetooth Hands Free Bluetooth Audio Streaming. Make and receive calls, play and control music and apps like Spotify/Pandora wirelessly