Arrived in about 4 weeks, well packed and unharmed. I tested the board with both Bluetooth and Analog input and from 12 to 24 volts. The sound is clear but it is really not powerful. it may be good for very little speakers or Headphone. This model the Flat one, is less powerful than the other one with Bluetooth soldered above it. They use I think same components, still less power, go figure. The Layout and output Inductors of the board I received is different from one in description though. Don't know if this may have an impact on its output power. Thank you.