1. USB charging: built-in Li-ion battery rechargeable by USB and USB cable included, which not only reduces the cost of frequent battery replacement, but also protects the environment. The intensity of machine exercise increases by 50% compared to battery-powered products. Fully charged in 1 hour, you can get continuous work for 3 to 4 hours, you can charge this muscle stimulator with your laptop or 2.Fat burning and toning the muscle and body shaping: the consecutive use of this product for 8-10 weeks shows an obvious effect. 2 to 4 times a day, 20 minutes per hour. 60 minutes of sit-up and swimming for half an hour and two weeks of diet. This muscle toning can help tone, tighten and strengthen the muscles in your body. You will be able to obtain a better silhouette after a consecutive use of this product for approximately 2 months. Modes and functions: 【Modes and functions】 1.Mode 1 & 2 fat burning in these two modes, the muscles move intensely and burn fat quickly. 2. Mode 3 and 4 strong muscle growth elastic movement, deep stimulation to support muscle growth. 3.Mode 5 and 6 body sculpting these two modes are composite modes which help to build a perfect figure.