Used only for operational checks and has not been used otherwise. There are no operational issues. The box, instruction manual, and warranty are missing, so please research how to use the product yourself. m(._.)m Product Description: Equipped with a unique "facial-specific interference wave EMS" developed to train both the deep muscles and facial muscles of the face. With a "clamp + apply" two-sided structure and four main functions, it approaches the appropriate areas "deeply and widely" like a professional's hands, such as "loosening," "warming," "toning," "training," and "delivering." It's a convenient and lightweight cordless handheld type. For those who want to train efficiently and thoroughly.