Zed - Soothes babies to sleep, just like the car. Zed mmics the feeling of being in a car. His clever technology recreates soothing low-frequency vibrations that are known to send babies to sleep. Simply place Zed on the mattress by your baby's feet and press the snooze button. The finely tuned vibrations ripple through the mattress, comforting your baby and encouraging a deep sleep.