... .USB,SD,FM function 4.OEM service 5.VFD display New design 4.1 amplifier speaker 1.Hot 4. ... in bass part, enable low-mid section fidelity clean and exquisite4.Wooden enclosure wholly made by hand, high intensity, ... effectively eliminate resonance and cabinet noise5. With Standby,Input,Menu,VOL+,VOL- keys ... 4.1 amplifier speaker with USB/SD/FM function and VFD display