The Lint SOLO, a stand alone headphone amplifier has two inputs, it is designed to provide the best possible sound quality at a economical price. The unit has a direct input from our LLINTone or Prelude turntable pre amplifier via phono jacks. Or a 3,5 mm jack plug for a laptop, MP3 player, chromecast, smart phone or similar. Featuring Nichicon capacitors (as found in high end audio) the pure analogue sound is very impressive. In  short its simply a true anaolgue experience. A customer has even said this product takes no prisoners with a music source..Nichicon rocks !