AYO BT+ is a unique breathing measurement respirator series invented for breathing training and monitoring for asthmatics, sports, and general health. It consists of AYO BT plus one or two measurement modules, with Apps available on iPhones and Android-based mobile phones. Thanks to the unique modular design, the BT+ can be configured as a breathing measurement device, as well as diaphragmatic breathing training offered by AYO BT. Features: Unique 3 in 1 breathing device for asthmatics. Measure breathing during physical exercise. Allow measurement for nose breathing. Patented modular technology enables flexible use options. Instrument-grade accuracy. Key measurements: Spirometry testing Realtime breathing waveforms Breath Rate, Minute ventilation, Tidal volume Peak Flow Inhalation and Exhalation time and pauses Breath-hold time Power of breath and work of breath Summary breathing report for meditation and exercises AYO BT+ benefits: 3 in 1: Breathing measurement, training, and spirometry testing. Asthma and exercise-induced asthma management. Provide measured insights into your breathing health and capacity. Complement heart rate for key health metrics. Assist in practicing healthy breathing patterns effectively and accurately. Train your breathing muscles and measure breathing effort and efficiency. See your breathing improvement before you can feel it. Provide breathing data to trainers or clinicians remotely. Add breathing status in Apple Health App for tracking your overall health.