Product Name: SDE-2500 Manufacturer: Roland I am the first owner, having purchased this unit new. I used it for performances for two years from 1984 and then for about three months, and after that, I've only used it occasionally for recording and have otherwise stored it. I think it's in good condition for a vintage item, but please forgive the small scratches and the marks from tape (see the enlarged photos). Basic operation is normal, and the backlight is bright. Only the write button is slightly slow to return, but it works without any problems. All other switches are in perfect working order. There is no history of disassembly or repair since it was new. This is the famous model used by Tomoyasu Hotei for the helicopter sound. Please feel free to comment if you have any questions. #SDE-2500 #Roland #RackTypeDigitalDelay