BUILT-IN LED DISPLAY: For Easy Use. Conveniently Fits Into Your Cars Cup Holder. PLAY MUSIC FROM MULTIPLE SOURCES: From Your Cellphone Via Bluetooth Or A USB Drive. COMPATIBLE WITH MOST DEVICES: (Apple, Samsung, LG, Xiaomi, Sony) you will not have problems with compatibility. Advanced noise reduction system will guarantee you a quality crystal clear sound. One Button Answer reject. or hang up a call hands-free with built-in mic. EASILY CHARGE ALL UP TO 4 DEVICES: With 2 Built-in High Speed USB Ports Along With 2 Cigarette Lighter Power Sockets. LISTEN TO MUSIC AND SEAMLESSLY ANSWER CALLS: Through Your Car Stereo With The Bluetooth FM TRANSMITTER.