LINE6 DL4, a delay modeler. It was a pioneer of multi-function delay effects. I have confirmed the following: The R input does not work, but the MONO/L input works fine. The L and R outputs work fine. As it is an old effects unit, the casing is quite dirty. Instant purchase is OK. The original LINE6 adapter and a printed-out version of the manual (downloaded) will be included. As a bonus, an effects pedal book will be included. The following is an automatically generated product description: Multi-functional LINE 6 effects unit - Brand: LINE 6 - Color: Green - Accessories: AC adapter, Instruction manual - Model Name: Stomp Box Modelers - Functions: Delay, Echo Thank you for viewing.