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Flutter Valve Device for Lungs Adjustable Resistance for Personalized Training – It features an adjustable resistance dial, allowing users to customize their intensity. High-Quality Medical-Grade Material – Made with safe, durable, and easy-to-clean materials, this device ensures long-term use without compromising hygiene. Its medical-grade construction offers reliability and safety for daily use. Easy to Use & Drug-Free – This compact and lightweight Device fits comfortably in your hand and operates without the need for batteries or external power.