This is the portable Bithead amp/Dac that runs off of 4 AA batteries. They are rated to last over 40 hours! It is in great shape with approximately 15 hours on it so it’s in great shape. Includes all original accessories. Originally sold for $150 Features an effective crossfeed circuit and Hi/Lo gain switch. Here’s a review. https://www.techpowerup.com/reviews/HeadRoom/Total_BitHead/4.html Add $5.00 for shipping to lower 48 and I will cover PayPal fee.