Material: PUPower by: 2*AAA Alkaline Batteries(not included)Each EMS machine can be individually adjusted mode and intensity.You can also use 3 abdominal muscles posted simultaneously, to adjust the required mode and intensity respectively.Adopting EMS technology, EMS (Electrical Muscle Stimulation), which builds muscles through the skin, it is recognized as an effective method of training muscles.It is suitable for abdomen, arms, waist and legs. With 6 exercise modes.High quality abs gel sheet, conductivity improves 30%.Ultra thin and compact. You could get away with wearing this underneath a sweater if you wanted at work and no one would know it's there, you can do muscle trainning in office, bedroom, or any place you want. Not just in gym.Easy to Use! Designed with ergonomics targeting abdominal muscle exercise. Fix the fitne gear to the position where you want to strengthen your muscle. Just pre the button to start the exercise.Note:1. Do not use it when you are sleeping2. The following people are not allowed to use the product or it may cause accidents, the problems of skin and body.-Internally transplanted electronic medical device, such as pacemakers.-Electronic medical life-support equipment such as artificial cardiopuimonary machine.-Electronic medical devices attached to the body such as electroncardiogram scanner.-Women who are pregnant or give birth to babies recently .