All of our products which have our own registered trademarks are tested in every step of production. Sale of our products is under our company's guarantee for total customer satisfaction. We know and appreciate our customer needs. We always continue to try to solve their needs quickly with our products quality and affordable prices. Benefits of our products are many, not least of being the advantage of getting back your money's worth in investing in its reliable long-term use and unlimited after sale services. Purchasing our products means, our technicians and laboratory are at your service.
We can always support our customers with our service parts.

BIYANG equipment is guaranteed against defects in parts or workmanship for a period of 3 year from the date of purchase (excluding loudspeakers and valves/tubes, except at the discretion of BIYANG. However, misuse or use contrary to the operating instructions supplied with your unit will invalidate this warranty. If any problem should occur, please contact the dealer who supplied your equipment.
Please Note: This online Warranty to new products purchased from an Authorized Domestic Dealer in the China only.
All products purchased from an Authorized International Dealer must be registered with the Authorized International Distributor. 
Please note that the warranty does not cover equipment that have been purchased from an unauthorized dealer or have been purchased as used.