Fully tested and working! Requires 3 D batteries not included. Battery compartment is clean with no corrosion. Push yellow star in "lights on "mode and glo worms face and story book light up and music plays. Press star in "lights off" mode and music plays only. Pink button causes bears in lower two corners to light up and giggle no matter which mode you are in .plastic straps attach toy to side of crib. Timer can be set for 5 , 12, or 20 minutes. So cute!