A-3 (5.1) audio product features: 1, 5.1-channel remote control with automatic/manual tuning storage FM Radio  2: the multifunctional spectrum display screen with 6 segment (VFD)  3: multiple sets of input function selection switch 2.1/5.1.  4: input signal auto search options. 5: multiple display options change. 6: multiple sound effects options. 7 power supply remote control switch and mute function. 8 built-in SD card music player, it may initiate playback; 9 may an external USB drive, freedom to play music; 10 built-in FM FM radio, music may take advantage of timely news. 11: strong neodymium-Iron-Boron magnet speaker unit; 12: high efficiency digital power magnifying glass, pure and beautiful sound quality, sound impressive.