... 4.1 multimedia speaker system Perfect sound system USB,SD,FM function OEM service Magnetically shielded 4.1 multimedia speaker system,card speaker,square speaker 1.Hot 4.1 home theater speaker , ... ,and FM function, remote control.3. 5.25" composite cone speaker adopted in bass part, enable low-mid ... 50W Signal-to-Noise ≥70dB Driver units Sub-5.25inch*1, Sat-3inch*2, Magnetically shielded Carton box size ...