2 Pieces Silicone Breathing Fitness Exercise Equipment Portable Throat Adjustable Resistance Breathing Exercise Device

Feature:Breathing exercise equipment to challenge yourself for better exercise and improve overall endurance.Vital capacity - it helps to expand and improve vital capacity without the risk of having to do a lot of aerobic exercise and burning calories.The portable device - Adventure lung breathing training instrument is very compact. Easy to carry.The adjustable resistance dial makes the simplest task more difficult, and can exercise more intensely according to your needs.Specification:Material: siliconePackaging list: 2pcs