Installing Batteries - Graco Simple Sway Owner's Manual

Installing Batteries (not included)
WARNING
To avoid injury: Remove child from swing before changing batteries.
With baby out of swing, open the battery compartment lid
by inserting a screwdriver into the coin slot. Insert four
D (LR20-1.5V) cell batteries.
CHECK that the batteries are put in correctly.
Your swing will not run if the batteries are put in backwards.