Thank you for viewing. I've checked all the input/output terminals before listing. I believe it functions correctly as a DI. I've also confirmed operation with a 9V battery and phantom power from a mixer. This item shows a fair amount of use. It appears that letters and symbols were originally written on the panel with a permanent marker, and the color has faded, leaving faint traces of the writing visible up close. Please examine the images carefully, as this may be a concern for some. Instant purchase is welcome. I will ship on the same day of purchase if possible, or at the latest, the next day. Thank you.