To ensure product authenticity, warranty protection, and access to ChangBERT customer support, we recommend purchasing directly from:

• Amazon Official ChangBERT Store

• Walmart Official ChangBERT Store

• ChangBERT.com

Products obtained through unauthorized resellers, third-party marketplace sellers, liquidation channels, auction sites, or other non-authorized sources may not be eligible for manufacturer warranty coverage, technical support, promotional offers, replacement services, or product-related assistance.

ChangBERT reserves the right to verify proof of purchase when processing warranty claims and support requests.