This kit includes everything you need to build a 30W/channel stereo Bluetooth/USB multimedia player amplifier with wireless remote control without breaking the bank. Make a few holes and use a little solder and you'll be cranking up the music in no time. Pull out those old bookshelf speakers or design a new set with a 3-D printer and Dayton Audio speakers. The Bluetooth range is now 120 ft. instead of 30 ft. and the built-in USB port plays MP3 on thumb drives plus charges a smartphone.