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5.0 bluetooth version, transmission efficiency is higher, transmission distance is longer. Large size black gold heat sink ensures efficient heat dissipation. Potentiometer to adjust the volume, with a switch, it is easy to control the volume, very suitable for DIY speakers. Copper DC connector is adopted to withstand high current and no heat. 4*470uF green gold capacitor guarantees the power storage capacity and the continuous and stable power supply is the premise of good sound quality.