Improve arm definition Tones your muscles with EMS technology Offers 3 toning programs Up to 99 intensity levels Fits an arm circumference range between 25-45cm Replicates exercise Patented technology The New Slendertone Arms Male Accessory uses advanced clinically proven Electronic Muscle Stimulation (EMS) Toning Technology to target the biceps and triceps, helping you to achieve more toned, stronger arms. The product activates biceps (biceps brachii) and triceps (triceps brachii), replicating arm toning exercises for a full workout. All Slendertone products use EMS toning technology, which works by sending signals to your nerves to contract and relax your muscles, similar to regular toning exercise. This EMS technology has been used for over 50 years in sports and medical environments to strengthen and rehabilitate muscles. Please note that once this item has been opened it cannot be returned due to hygiene reasons. This product is operated via the Slenderton