SMAKN&reg; TPA3116 Bluetooth 4.0 Receiver Stereo Power Amplifier Board 2X50W Bluetooth 4.0 receiver. Supply voltage: 8 ~ 26VDC. 3116 stereo power amplifier chip 2X50W, with a heat sink (recommended above 24V 3A power supply). Applicable Speaker Impedance: 4, 68 ohm. Package Include: 1 x New TPA3116 Bluetooth 4.0 Receiver Stereo Power Amplifier Board 2X50W.