Built-In Bluetooth Built-in Bluetooth for hands-free calling with embedded microphone, as well as music streaming. Front USB (Universal Serial Bus) Front USB (Universal Serial Bus) input for playing music stored on a USB (Universal Serial Bus) memory device. Optional CCA755 cable can be used to connect USB (Universal Serial Bus) memory. Front auxiliary input for connection of portable audio players & other equipment. 2-volt / 2-channel audio pre-out CZ301 Es built-in wireless Bluetooth interface supports HSP/HFP for hands-free operation & phonebook download. You can easily communicate with the outside world by listening to phone calls through the cars audio system & talking through the embedded microphone. & with A2DP/AVRCP support, you can enjoy music streamed from your mobile phone. CZ301E features an MOS-FET (Metal Oxide Semiconductor Field Effect Transistor) power amplifier capable of delivering 4 &8212; 45 watt of high quality sound with superior linearity & less distortion than conventional power amps-even with the volume cra