This T-Rex makes a realistic sound that is hard to believe and could be quite irritating after a while. The tail would not stay attached until I loosened the body slot screws, inserted the tail and retightened the screws. You will need a slinder, long shank small tip phillips screrwdriver. I was able to get the package mount screw attachment off with out the screw driver but It would be much eaiser with a thin phillips. The on-off switch broke after about 10 hours of "on-off" "on-off" playing. Walmart replaced the toy with no questions asked. This "toy" will thrill your child (maybe even scarey). It is not to good for rough hands on play. The Jrassic Park T-Rex would be better for rough play, we bought this one also.