Zed by Rockit: Helps babies sleep with calming vibrations and crib nightlight.

Zed produces car-like vibrations known to put babies to sleep
6 gentle vibration modes with 1 hour auto shut off
Compact size that works on any type of mattress
Safe to use from birth
Built-in night light with 3 brightness levels plus a night mode
Up to 50 hours of battery life (measured at slowest speed)

Takes x2 AA batteries