Check the listing for details. Audio receiver template wireless speaker power amplifier modified DIY Bluetooth. Color: Green, Condition: New. Listed at 7.29 USD. Features:Warm Tip: This product is not a power amplifier board. Q: individual customer inquiries: how to connect capacitance resistance?A: If the amplifier board does not have input capacitance, this time need to connect the capacitor, or power interference, only in parallel above the power supply, generally do not, on the resistance, this is connected to the LED! The module stereo output, built-in Bluetooth antenna structure is simple, the supply voltage of 3.7V or 5V power supply options, can be used as an ordinary amplifier, active speakers to increase the Bluetooth connection function. 7PIN output interface for the pitch 2.54mm, 7PIN output interface: power, ground, left channel, right channel, mute, LED status indication, reserved port. Which LED state port, an external 100 ohm resistor in series LED indicator connected to the ground, Bluetooth is not connected for fast flash, Bluetooth connection after the success of slow flash. The volume is: 30mm X 20mm X 3mm. Delivery list:1 Bluetooth motherboard2 electrolytic capacitors1 LED1 resistor