The U2020 user manuals are listed below as attachments.
This synthesized wireless microphone product (diversity receiver, beltpack Tx, handheld Tx and multicoupler) was originally manufactured by Vega Wireless in the mid 1990s and was transfered to Clear-Com manufacturing in 2000. It was produced at Emeryville until 2004 when the product was officially made obsolete.
Production Wireless in Burbank California still repairs this product.
Production Wireless Services
1821 West Verdugo Ave.
Burbank, CA 91506 USA