... /SD card 3.With FM radio,USB 4.Unique waist drum,colorful Newest best loundly sound unique waist drum design mini speaker SP-001 ... % 2. Frequency response: 150~1800Hz(±3dB) 3. SNR : ≥80dB4. Loud Speaker : 2 inch ( external Diameter 45mm ) 5. Line in : Configure 3 ... unique full digital audio upgrade,The new aluminum disphragm micro-speaker,clear treble,basspure,unique design,the sound quality is even ...