Exercise Device 2 Pack, 1 Pack Adjustable Resistance for Trainer , Exerciser Trainer Daily Fitness Training, Easy-to-Clean Design Black

[Daily Exercise] - Breathing trainer provides a controlled, more difficult breathing condition, thereby helping to improve physical fitness.
[Adjustable Resistance] - The resistance can be adjusted to meet different needs, combine with other exercises for better results, such as jogging and cycling.
[Versatile] - Breathing exerciser helps to strengthen the throat muscles, especially for singers, swimmers, gymnasts and martial arts athletes.
[Portable & Practical] - Light weight, small size, easy to clean and carry. You can do breathing exercises anytime, anywhere.