... function OEM service Magnetically shielded 4.1 professional speaker 1.Hot 4.1 home theater speaker , solemn and delicate overlook.2.With USB ... card read,and FM function, remote control.3. 5.25" composite cone speaker adopted in bass part, enable low-mid section fidelity ... +15W*2=50W Signal-to-Noise ≥70dB Driver units Sub-5.25inch*1, Sat-3inch*2, Magnetically shielded Carton box size ...