[Dual-Adjust Resistance System] Experience tailored breathing training with our advanced device featuring a bilateral resistance adjustment. This allows for precise resistance settings on each side, catering to various training levels and enhancing the effectiveness for all users. [Maximize Training Outcomes] Our breathing trainer is engineered to push the boundaries of your athletic performance. It acts as a crucial auxiliary tool in your training regimen, helping you achieve peak results and surpass your personal bests in any sport. [Comfort & Safety First] Crafted from superior medical-grade silicone, the mouthpiece of our trainer ensures safety and comfort. Its unique triangular design with anti-slip particles offers a secure grip, making it ideal for extended training sessions without discomfort. [Ultra-Portable Design] breathing trainer is your perfect workout companion. Easily carry it to various activities like yoga, swimming, or cycling, ensuring you never miss your breathing exercises. Colour:Black Material:Silicone Package Contents: 1 x Breath Trainer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.