This Ray Samuels Audio "The Hornet" portable headphone amplifier is a must-have for audiophiles on-the-go. Its compact size allows for easy transportation without sacrificing sound quality. Compatible with a variety of headphones, this amplifier provides a powerful and dynamic sound experience.Whether you're at home or on-the-go, this amplifier is perfect for enhancing your listening experience. With its sleek design and superior technology, you can enjoy your music like never before. So grab your headphones and take your music to the next level with "The Hornet" portable headphone amplifier. There is light scuffing on the surrounding side surfaces.This takes a regulated 12V DC power adapter which is not Included but does also get powered by a 9V battery.