Little bear P2-1 BLACK color HiFi valve tube headphone amplifier amp preamp It's new version headphone amplifier. Actually it's tube buffer + amplifier work model. you can use it as preamplifier or headphone. Warm your music, better for listen person voice, better for 12~200ohm headphone With metal case it's good quality,and cool. In the end, all things you get is one assembled headphone amplifier + one transformer + 3 units 6J1 tube,(without user manual,connect cable or any other parts) To USA buyer,we will ship item to you by USPS express.6-10 days arrival, we do not ship it to other country yet.