The Slendertone system for arms tones your biceps and triceps, without the need for lenghty gym workouts. The system firms, strengthens and defines your arms through Electronic Muscle Stimulation. Signals are sent to the gel pads, which you attach to your arms, to activate the nerves that control your muscles, causing a deep muscle contraction. By using the Slendertone system for arms 5 times a week for 4 weeks, you will be able to see an improvement in your upper arm tone and definition. Product benefits: 4 adhesive toning pads that are easy to attach 3 muscle toning and development programmes so you can choose one to suit you Up to 99 intensity levels that can be adjusted to your preferred level 'Warm up' and 'cool down' phases to give your muscles time to get used to the electronic signals Certified to medical safety standards Requires a Slendertone System Controller which is available with the Slendertone System Abs belts.