Slim enough to fit in your hand and easy to hold without straining your wrist, allowing you to do skincare anytime, anywhere! It's a C-type rechargeable device, making it easy to use. *Charging adapter is not included. We recommend that you read the included instruction manual before using the device for the first time. We recommend watching a video and following along when using it for the first time. When using it for the first time, start from level 1 and gradually increase the level while protecting the application period.