The quality is very good, exactly the same as the seller described, very satisfied, really like it, completely exceed the expected value, very strong and durable, I have used it for about ten days, the battery life is very strong, the vibration frequency is just right, especially Her noise is very small, she is very comfortable when she relaxes her neck and shoulders, and her ears are completely unaffected. Thanks to the store for making such a good product, one machine is at hand, free to contr...