T4 Transforming Solar Robot. OWI's geek squad has dusted off their labs coats and goggles to concoct their latest triumph.T4 Transforming Solar Robot. "T4" not only has more transformations but also comes equipped with larger parts, meaning that your younger child does not have to be excluded from high quality robot fun. "T4" is completely solar-powered so you never need to buy batteries. Not only will "T4" provide your child with a new understanding of solar power as a source of renewable energy, but will also get your kids outdoors for some wholesome fun in the sun. This kit gives your child the option to easily transform between one of four different modes: Robot - walking legs as well as moving wheels. Insects - 6 walking legs as well as moving jaws. T-Rex - 2 walking legs and moving jaws. Drill Vehicle - similar to a miner's driller/drilling bit and moving wheels. If your children are glued to smart-phones, give them an opportunity to acquire solar power knowledge, learn about mechanical transmissions and get them outside to play. Amazingly, you might find yourself engaged in conversation with your child, thanks to their newly acquired "expertise"