Feature:1. Stereo output module with built-in antenna compatible with Bluetooth for simple structure.2. Active speaker compatible with Bluetooth.3. The 7-pin output interface is: + power, ground, left channel, right channel, mute, LED indicator and reserved port. Where the reserved port is connected in series with a 100 ohm resistor.4. The LED indicates that the module is not connected and flashes quickly. It will flash slowly after connection is complete.5. The module can be used as an ordinary power amplifier and active speaker to add connection function compatible with Bluetooth. 7PIN output interface is 2.54mm through hole pitch.Specification:Item Type:Audio Receive Module Compatible With BluetoothPower Supply Voltage:3.3V,5V(Optional)Hole Pitch:2.54mm.Package List:1 x Module2 x Electrolytic Capacitor1 x LED Indicator1 x Resistor