Hidden inside this adorable Nighty Night Owl Smart Sensor is a white noise machine. It plays soothing sounds at bedtime and it's triggered to restart any time in the night your baby makes a peep. Nighty Night Owl Smart Sensor - This adorable owl is a white noise plush that plays sound plush that plays 8 soothing sounds and melodies! These soothing sounds help babies and children go to sleep faster. The Nighty Night Owl includes a Smart Sound Sensor. If your baby wakes up and makes any sound, the sensor restarts the music to help baby fall back asleep. When bedtime beckons, the plush easily attaches to any crib by using the hook-and-loop fastener behind its head. Features: Smart sensor; Four White Noises; Four Calm Lullabies; 23/45 Min Sleep Timer; Volume Control; Easy Hook and Loop fastener for attachment to crib, stroller or car seat;.