Used only once. "AD Reco," an analog recorder for smartphones that allows you to record and listen to records and cassette tapes on your smartphone. [Compatible Devices] Smartphones/tablets with iOS/Android OS/Walkman (NW-A100/NW-ZX500 series) [Supported OS] Android 5.0 - 10.0 / iOS 11.0 - 13.0 [Input/Output Terminals] PHONO IN L/R x 1 each (RCA jack) / LINE IN x 1 (stereo mini jack) / LINE OUT x 1 (stereo mini jack)