With the myHummy mobile app you can: Switch the sound device on and off Select your preferred sound - there are 5 types of white noise to choose from, which resemble: a hairdryer, vacuum cleaner, sea waves, rainfall, and amniotic fluid with a heartbeat. Change the volume level Set the timer - the timer can be set for a maximum of 12 hours. At the end of the pre-set time the volume will gradually fade out. Enable and disable the Sleep Sensor - When enabled, the Humming Heart