MyHummy white noise toys are a unique bunch. Playful during daytime and soothing at naptime, myHummy is a reliable and smart sleep aid for babies. Every myHummy features a Sleep Sensor which knows when the baby is about to wake up. You can also use them in non-stop mode for 12 hours of uninterrupted humming. MyHummy emits 5 types of white noise resembling: a hairdryer, vacuum cleaner, rainfall, ocean waves and amniotic fluid with heartbeat.