I need to send my unit back for repair under warranty. Do I need to include a proof of purchase with the unit?
For a product with a serial number, you can get it repaired without a proof of purchase but we recommend that you include it.
Your proof of purchase tells us when your warranty is valid from. While not having or including one, means we'll rely on our own date of sale to the reseller, which could - potentially - be weeks or months before the product was sold to you, which can ultimately shorten the warranty term on our manufacturer's warranty.
For a product without serial number (such as PolyTune Clip) or any product on which serial number is not readable, a proof of purchase is required to have your product repaired under warranty.