The Asthmatic Child Companion is a rehab device for children with asthma that provides both breathing training and air purification. The playful bubble-like training handle makes using the device engaging and fun, helping to reduce the psychological burden of illness and recovery. As children blow into the handle to complete their breathing exercises, the device’s screen displays changing bubbles, creating a game-like interaction to encourage use. The handle also detects nitric oxide levels in exhaled breath, providing real-time analysis and tracking of the patient’s condition. When not in use, the handle combined with the main device can serve as an air purifier.