d with kibble turn it on and watch the fun begin. Moves in unpredictable rolling action while also randomly dropping treats. Encourages active play for dogs of all sizes. Adjustable window opening controls how quickly food is dispensed. Holds up to 1/2 cup of dry kibble or hard treats under 1/2" wide. Durable plastic shell withstands rough play. Tough rubber wheels roll quietly and easily on indoor floor surfaces. Sleep mode gives dog a break after 10 minutes. Requires 3 AA batteries (NOT included).