Rockit Zed Vibration Sleep Soother and NightlightZed is a vibration soother and nightlight that mimics the feeling of being in a car, with soothing low frequency vibrations to help send babies to sleep. Place Zed on the mattress by babys feet and press the snooze button the finely tuned vibrations ripple through the mattress, comforting baby and encouraging a deep sleep. Features: Six calming vibration modes with 1 hour auto shut down Works on any mattress type spring, memory foam, natural fibre