Color: SilverIntroductions: Material: Plastic Your muscles are stimulated twice with up to 100 exertion and relaxation impulses. That way you will get your desired results twice as fast.Simply apply it to the body parts that you want to train and switch it on. Gym form Duo is very handy enabling you to reach and train all problematic areas.Features: Completely safe to use pain freeHelps to burn your fat and makes you slimOutput Voltage: DC 6VFrequency: 2Hz~250Hz Dual contact muscle stimulation technology gives your muscles a great workoutGently makes your muscles contract and relax strengthens and sculpts muscles