*Note: When replacing parts, disconnect all power sources (e.g., batteries). *Even within the warranty period, the following are not covered. 1. Failure or damage caused by repair or modification. 2. Failure or damage caused by improper handling (e.g., dropping, impact, or water ingress). 3. Failure or damage caused by external factors such as natural disasters, pollution, or abnormal voltage. 4. Failure or damage caused by using an incompatible model or improper installation. Returns: In principle, we accept returns of unopened, unused items purchased from Amazon.com within 30 days of receipt (excluding non-returnable and exchangeable items). Please inspect the condition of the item immediately upon receipt.