Step back in time and journey back to the days of the dinosaur with rather our spectacular build your own walking t rex the first challenge this gadget sets is the painstaking craftsmanship involved in connecting all of the 80 wooden dinosaur pieces together no tools or glue required once that bit is done and the sound activated movement sensor requires 3 x 15 v aaa batteries not included is delicately popped in the fun will really start thanks to the power of sound all you need to do i