Thank you for viewing! This is a set of two Pioneer CDJ-400s! The CDJ-400 on the left could play CDs and change tempo! The CDJ-400 on the right powers on, but could not play CDs. I don't know the detailed usage, so I am selling these as junk items. For those who can fix them or need them, thank you! - Model: CDJ-400 - Brand: Pioneer - Type: DJ CD Player - Features: MP3 compatible - Features: Set of 2 - Color: Silver - Connection Terminals: USB terminal - Operation Buttons: Loop, Cue, Play buttons - Display: Digital display Thank you for viewing.