I made a Raspberry Pi Zero, HiFiBerry Hat, Volumio audio player that plays from a local or internal folder on USB sticks with over 500 albums in it FLAC format. An external antenna increases the range. The 5V buck converter allows you to use any power source from 5 to 34 volts. The screw holes are unthreaded, but the included mounting screws do their job well as they're tougher than softer aluminum.