Offical digital dudz t shirt the kids moving ninja skills t shirt showing off your ninja skills has never been this easy perfect for halloween or just any party where you want to make an impact how does it work 3 simple steps to bring the t shirt to life 1 download the free app 2 insert your smartphone running the kids moving ninja skills animation 3 the t shirt is alive just add smartphone the velcro pouch on the side of the kids moving ninja skills t shirt measures 3 75 x 6 1 inch