Ernie It ’s wonderful. I bought it for my wife for our grandsons baseball video games. She loves the continuous heat it provides on the back of her neck. Wonderful products. thermal seal gives the heating technique with toughness& moisture protection on/off button makes it possible for easy access https://what-is-the-best-heated-v83456.full-design.com/who-makes-alpha-heater-secrets-74621178