SMAKN&reg; Bluetooth stereo plate / wireless Bluetooth speaker / Bluetooth speaker module / Bluetooth board XL3256 Bluetooth stereo receiver module main chip BK3256 design. High integration and small size. Class2 power level 2dBm. Follow Bluetooth V2.1 + EDR Bluetooth specification. Powerful noise cancellation circuit. Effective transmission distance of up to 10-20 meters. Support for external antenna farther