DSP ECHO CANCELLATION: The echo cancellation on this device ensures crystal-clear conversations during calls, even in noisy vehicles. That means you won't have to shout to be heard while driving. BUILT-IN CHARGER AND CONTROLS: Charge your device with the 10-Watt 2.1AMP USB port on the 12V car charger and control the BTFREQ’s volume up/down, play/pause, answer/hang up the phone, or using voice controls through your phone. CONVENIENT DESIGN: The convenient design of this device includes a flexible neck, which allows you to position the BTFREQ’s LCD screen for optimal viewing while driving or as a passenger. WIRELESS MUSIC STREAMING: Wirelessly Stream music from the Digital FM transmitter to your vehicle's FM stereo. This device makes it easy to stream music from your phone to an older model vehicle. BLUETOOTH HANDS FREE CALLING: Make hands-free calls from your Bluetooth enabled smartphone using the Universal Hands-Free Car Kit and Digital FM Transmitter. This device charges your phone while streaming audio.