Halloween zombie head Lawn Stakes Light Up sounds battery operated

Set of 4 light up zombie head yard decorations, comes with stakes. Heads measure about 6.5" tall. Requires 3 AA batteries, not included. Some wear/imbedded dirt from previous use. Spots of paint loss most noticeable on their chins. One's eyes don't seem as bright as the others, but they all do work. Button to turn it on needs to be pushed towards on - it looks like you should push it down, but that's not how it works. Sound activated. Please see pictures.