Feature:1. Strengthen Respiratory Muscles: Breathing training device uses resistance to strengthen respiratory muscles, alleviate breathing difficulties, and improve overall health and vitality.2. Increase Lung Capacity: Increase breath strength and train your diaphragm, which with a light effect progress bar, our device enhances respiratory muscle strength and lung capacity.3. Easy to Use: Lightweight and portable, which can be used anytime, anywhere. It is recommended to wear it for 510 minutes per day and start training with 35 sets per day4. Breathing Training: Breathing trainer effectively increases resistance on respiratory muscles to improve efficiency and endurance with correct usage within 4560 days.5. Widely Used: Suitable for yoga enthusiasts, gym goers, sedentary individuals, people with respiratory difficulties, singers, and people looking to achieve a slimmer waistline.Specification:Item Type: Smart Breathing TrainerMaterial: Medical acrylicSize: Approx. 13 x 3 x 1cm / 5.12 x 1.18 x 0.39inBattery: 5V lithium battery 200mAh (built in).Package List:1 x Breathing Trainer4 x Replacement Inhalation Nozzle1 x USB Cable1 x Instruction Manual