From As Pharma Deals Progress, Propeller Health Sharpens Its Strategy:

Propeller Sensor Attached to Respimat Inhaler
Propeller Sensor Attached to Respimat Inhaler

An electronic device developed by Propeller Health snaps on to the Respimat inhaler, which is developed by the German pharmaceutical giant Boehringer Ingelheim. Photo courtesy of Propeller Health.