TASCAM Tascam Portable CD Guitar Trainer CD-GT1 MK2 ・Main unit (TASCAM CD-GT1MK2) ・AC adapter (PS-PS5) ・Instruction manual (Junk) Please consider only if you understand that this is a used item. Instant purchase OK. This is a portable CD player that can change the tempo and key of songs, useful for ear training. Also, even without a CD, the amp simulator allows for optimal nighttime practice with a guitar, the unit, and headphones.