Cloud B Nighty night owl - Smart sensor will relay you even at night! When your baby wakes up or wakes up, the owl sound sensor automatically starts to make noise to help your baby get back to sleep. It plays different soothing mood options: maternal heart beats, summer rains, surfing the ocean, whale singing special sound activating sensor it reacts and replays its soothing sounds when baby is heard. Three sound levels that adjust the sensor to ambient noise. It plays the latest tunes at the same sound level as the previous one.