This is a Demo item, meaning it was used on a showroom floor so it is being sold at a reduced price. It may come without original packaging and may have minor blemishes. Some rack units may have deeper scratches on the chassis.
The HA106 headphone amp has a rechargeable battery built in, which can be charged by a micro USB cable. Combo bass/treble control allows you to tweak the tone to your liking. With an input gain control and LED indicators you can be sure the level coming in is at the proper level before adjusting the headphone volume. The headphone jack fits 3.5mm connectors and the input side can take either 3.5mm or 1/4" stereo TRS connectors.