... :30-50W 2.grinds sand material MDF 3.MP3,CD,PC input speaker 4.high fidelity loudspeaker Sound Loudspeaker(X-210) Features ... :1.high frequency2.fantastic sound quality3.MP3,CD,PC input4.grinds sand material MDF5.teachers use,classroom speaker,school speaker6 ... sand MDF box body, paint grille.2. High fidelity,strong sound penetration and good effect.3. Long distance transmit signal, simple ...