Monkey & Frog Giggables. Both have been tested and work. Dimensions: 3.0" x 3.0" x 3.0" Age Range: 6 - 36 months Batteries: 2 AG13 Batteries Required (Included) From product description: "They giggle, they roll, they talk and they make babies laugh! They’re Giggables™ from Bright Starts™! Adorable little balls of fun that baby can push and roll. They tell baby what kind of animal they are and make fun sounds as they wobble and roll. Babies love getting their hands on these cute characters that are full of laughs." FYI, batteries are replaceable. Top & Bottom held by 6 push on pillars. Use Flat bladed screwdriver and gently prise apart top and bottom. Remove 3 screws to get to pcb. Remove pcb screw. 2xAG13 batteries underneath.