How is the Lulla doll different from other soothing plush sound machines?

Both the purpose and the design of the Lulla doll differs from other seemingly similar products. The purpose of most other sleep related toys is to help babies fall asleep with the help of white noise, sometimes resembling womb sounds. The Lulla doll, on the other hand, is designed to help babies stay asleep for longer periods at a time, and help babies stabilize and feel safe. The doll is imitating closeness to another person, more than trying to replicate the womb experience. The doll aims to do this with its unique real life sound that plays for 8 hours. Other products only stay on for 15-45 minutes (or are movement activated), the sound file is not this large and the sounds are usually not real-life.