... USB/TF CadDetailed Product Description1, professional presentation, the leading portable Bluetooth spit eaker phone:Bluetooth chip, using the latest V ... 150-18000HZ (+ /-3dB)3) signal to noise ratio: ≥ 70 dB4)speaker: 45mm outer diameter, magnetically shielded 4 Europe5) LINE IN connector ... is betterColor: red, blue, black, silver, BLACK FQ Bluetooth Speaker,Portable Speaker,USB Speaker KS-B208