Child's Colorful Junior Calculator with Memory - 3D Buttons, Sounds, Multi-function. COLORFUL CALCULATOR : Get your little one started on the path to math with this colorful child's calculator. FUNCTION : With all of the functions of the more serious looking models, this jumbo sized kid's model is easy for the little ones to hold and control. BATTERY : Operates on 2 "AA" batteries (not included). SOUND : A special key lets them turn on/off a sound prompt that chirps each time a button is successfully pressed. SIZE : Overall dimensions of the calculator are 6 1/2"L x 3 3/4"W x 1 1/2"H.