STAX Hybrid Dog is an interactive building set that combines traditional bricks with electronic STAX bricks to create a variety of illuminated and animated models. With its motion-activated power STAX, sound STAX, and light STAX, you can bring your creations to life with dynamic lighting effects and realistic sound effects. The rechargeable 4x4 Mobile Power STAX (Item# S-11503) can be purchased separately to replace the button cell battery and provide a sustainable power source for your STAX creations.