100%
Koss Porta Pro On-Ear Headphones with Case
by Koss— Made in Milwaukee, WI
Verified American Made
80% — High
Brand produces some items overseas; score reflects USA-specific verification
Manufactured in Milwaukee, WI
Manufacturing in USA since 1958Verified through 3 independent sources
- Brand website
- Product listing
- Known factory location (Milwaukee, Wisconsin)
This brand also produces some products overseas. Only verified USA-made items are listed here.
See all products made in WisconsinIconic open-air on-ear headphones from Koss, made in Milwaukee, Wisconsin since 1984. Lightweight collapsible design with Temporal Pressure Gradient drivers delivering dynamic sound. Lifetime warranty included.
