ADJUSTABLE RESISTANCE: Features a simple dial mechanism to increase or decrease breathing resistance, allowing multiple personalised training levels for all fitness stages. SAFE SILICONE MOUTHPIECE: Made from 100% pure silicone, the non-slip bite design is soft, elastic, and fits the mouth shape securely for comfortable extended use. VERSATILE USE: Ideal for runners, swimmers, gymnasts, martial artists, and athletes across track and field, as well as individuals managing COPD or asthma. DURABLE ABS HANDLE: The threaded ABS handle design ensures long-lasting durability, and the device is easy to clean and maintain after every session. COMPACT AND LIGHTWEIGHT: Measuring 6 cm × 10 cm and weighing just 70 g, this portable breathing trainer can be used anywhere, anytime.