Over the last 10 years, my group has developed and commercialized PMUT-based systems for consumer electronics applications, starting with air-coupled PMUTs used for time-of-flight (ToF) range-finding and human presence sensing. These ToF sensors were commercialized by my startup, Chirp Microsystems (now part of TDK), and are used in many products such as smart-locks, robot vacuum cleaners, and laptops. We subsequently developed an ultrasonic fingerprint sensor based on the monolithic integration of PMUTs with CMOS that is used for biometric authentication.