Wonderball Kit Product# MR1008  $79.95  Free Shipping Wireless Remote Controlled Wonderball is an RF controlled wonder. It spins on a dime and moves at blazing speeds. Movement: Two (2) tracks driven by two (2) DC motors. Control: Infrared light source and light detector.Dimensions:6 9/32”diameter Requires one (1) 9V (part # 590009) and six (6)“AA”batteries (part # 590001).