The Bas Rutten O2 Trainer is an official workout device designed for respiratory training and lung health. Made of silicone and plastic materials, this cylindrical-shaped device comes in a sleek green color with a compact size of 7.6x4.88x1.81 inches. It features 14 different settings and an air resistance mechanism, making it an effective tool for improving lung capacity and overall health. Made in the USA, this lightweight device weighs only 0.68 pounds and comes in a single box, making it convenient to use and transport for anyone looking to enhance their respiratory fitness.