Be sure to add me to your favorites list Original Service Manual for the Boss WS-20 / WS-20M Wireless System (Service Notes, Schematics, Parts List). This is an original Roland / Boss service manual for the WS-20 Wireless System for guitar, and the WS-20M Wireless System for microphone units. It is an original service manual, in English (and some Japanese), in very good condition, complete and detailed. With specs, parts list, exploded views, several circuit board diagrams and more. This booklet is an original Roland document, printed in Japan, from 1990. This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thanks for looking! Check out my Store!