Our best seller is designed with interactive features that will stimulate pet's nature of hunting, and help fully mobilize their enthusiasm and curiosity. Wicked Ball is going to give pets the attention, interaction and exercise they crave for when you are not around. 100% Automatic & Intelligent Companion, Built-in Obstacle Avoidance Sensor, Water-Proof and Scratch-Resistant Materials, USB Rechargeable and Replaceable Outer Shell. Colors: Yellow, Green or Blue.