Pumps air into airbags from feet to legs in a continuous cycle to make your muscles feel like kneading massage by hands. 2 massage modes,3 levels of pressure intensity with 10 different massage techniques and methods. 20 minutes auto shut-off function, safe and reliable. You can restart it if you need Adjust the calves' size via velcro or with the two free extensions. The perimeter is from 14.6in to 28.5 in. Suit for different groups. DC12V/1.0A UL adapter. Safe and reliable.Easy to operate with the portable controller. Comes with a mesh storage bag. Easy to take at home, in the office, or on travel. Notice: The wraps work only when both air hoses are connected to the controller correctly. People who are receiving medical treatments should consult the doctor before using the product.