Easy to Use | When doing breathing training, select the resistance level by turning the main body of the product to the left or right, then breathe in by covering the mouthpiece with your lips. You can expect results with 30 minutes of exercise a day. Easy to Clean | When cleaning this product, remove the mouthpiece, mouthpiece link, and cap from the main body (only the mouthpiece can be removed) and wash them with water. After that, make sure to dry them completely to prevent the spring inside the main body from rusting. The product cleaning method is explained clearly in the video. $300,500,500 Breathing Training Lung Training Low Resistance Respiratory Muscle Exercise Device Breathing Training Lung Training Q