Feature: 1. Respiratory Muscle Training: Lung exerciser device works by creating resistance when you breathe, effectively improving your respiratory muscle. 2. Multifunction: Breathing lung exerciser can reduce breathing difficulties, improve exercise performance, speed recovery and improve overall health. 3. Increase Lung Capacity: Integrated breathing training device, which can effectively improve lung function and prevent respiratory diseases. 4. Portable: Respiratory muscle training device is suitable for people other than patients or professional athletes, which is small in size for easy to carry. 5. Acrylic Stainless Steel: Handheld breathing exerciser is made of acrylic and stainless steel, safe and sturdy, which allow you can use it at ease. Specification: Item Type: Breathing Exerciser Material: Medical Acrylic, Stainless Steel Size: Approx. 7 x 4 x 8cm / 2.8 x 1.6 x 3.1in. Package List: 1 x Breathing Exerciser1 x Manual