Features: Airs Compression Technology: Equipped with advanced airs compression to deliver effective massage to feet, calves, thighs, and knees. Built-in Heat Function: Integrated heating option to enhance circulation and speed up muscle recovery. USB Charging: Convenient USB charging ensures easy power ups so your massager is always readys to go. Targeted Relief: Specially designed for alleviating symptoms of varicose veins, leg muscle fatigue, cramps, swelling, and edema. Versatile Use: Suitable for use on various parts of the leg, including feet, calves, thighs, and knees. Notice: Due to the different display and light effect, the actual color maybe a slight different from the picture color. Please allow 1-3cm differs due to manual measurement. Description: Rated power: 9W Operating voltage: 5V Charging voltage: 5V Charging current: 2A Battery capacity: 1800mAh Unfolded Size: 57*30cm Package List: 1/2pcs Portable Leg Calf Massage Machine