Clarion M505 Boating Radios Marine Digital Media Bluetooth USB/MP3/WMA Receiver Global AM/FM/Weather Band Tuner Built-in Bluetooth with aptX for HFP/A2DP/PBAP/AVRCP Pandora Internet Radio Control via iPod/iPhone connectivity SiriusXM Ready with OPTIONAL SXV200/300 Tuner Built-in Microphone and External Microphone Ready with OPTIONAL RCB204 or RCB199 2-Zone Entertainment: Main and Second Zone source control 6-Channel / 4-Volt RCA Output w/ Built-in Low-Pass filters 2-Channel / 4-Volt RCA Output fixed for Second Zone 3.5mm Audio Auxiliary Input (Front) Front USB Port with iPod/iPhone Direct Control via USB 50 Watts x 4 Built-in Amplifier 3-Band Parametric Equalizer for Sound Adjustment Meets or Exceeds ASTM B117 (Salt/Fog Exposure) & ASTM D4329 (UV Exposure) Humi Seal Coating on PC Board