The following is the recommended power supply for the BR-600:
- BOSS PSA-120S or PSA-120T
These can be purchased online or from a dealer:
https://www.boss.info/us/dealer_locator/
https://www.google.com/search?q=boss+psa-120s&ie=utf-8&oe=utf-8
Caution: The use of any other power supply may cause malfunctions and/or permanent damage to the product.