The Oveallgo ToneX HighFrequency Body Sculpting Fitband is an innovative device works by using High-frequency technology to generate vibrations that penetrate the skin and stimulate the muscles. These vibrations create a small bubble on the surface of targeted fat cells, leading to a process called cavitation. Oveallgo ToneX HighFrequency Body Sculpting Fitband An Innovative Design Fitness Device OUR GUARANTEE We are confident that we offer some of the best products on the market. Therefore, we provide a 30-day guarantee. We will make every effort to ensure that you are completely satisfied with your purchase. Online shopping can seem daunting. We want you to know that there is absolutely zero risk of purchasing something. We won't make it difficult if you don't love it. We offer email and ticket support 24 hours a day, 7 days a week. If you require assistance, please contact us. Please contact customer service if you have any problems with your purchase.