Worked okOne dinosaur didn't make any noise. The cap on the wheels are senseless and checking hazard. The body broke on the 1st dayThese are great! I got them as a gift for my almost 3 year old great nephew. He loved them! Upon arrival I opened the package to make sure they worked. Came with batteries and a screw driver to get the battery compartment off, which was a little trying. They were really stuck on there! Put the batteries in and they fired right up! There is a little round stopper in the bottom of these that if you leave on it will allow the child to push the cars around. If you remove them the cars will go in circles or roll around untill they bump into something and they're off again in another direction. The roar noise is constant lol but my little nephew loves them!We've only had these dinosaur cars for a few weeks, so I can't speak for lasting durability, but they look nice and seem pretty sturdy. It does as described: drives around on its own, flashes lights and makes a noise that reminds me of Godzilla. I'm taking off a star because it is annoying AF to listen to. I wish there was an option of turning off the sound and lights. It NEVER stops making the Godzilla sound. I have hidden the cars at this point because I cannot stand listening to it. I would not gift it to any other family unless I didn't like them.Bought it for my grandson. The flashing lights didn't work after 2 days, and also didn't move by itself. Replace batteries. Still not working.The toys come with everything you need to get started. Batteries and a Phillips head screw driver. In order to take off the cover (over batteries) remove the round black cap. You’ll see it. More on that later.Once the batteries are in, turn on the toy, and put it on the floor. Works best on non-carpet floor.These Dino-cars will speed away when that black cap near the battery area is off. Even if the Dino-cat hits a wall, it will turn itself around!We are giving these to our 3 year old and 6 year old grandchildren fir Christmas. We think they’ll be a big hit!Nice for the moneyRecieved as a gift for my 2 year olds birthday. He loves these! They make a dinosaur noise but its not terrible loud so it doesnt get annoying. The lights are bright and look really neat in the dark. Best thing is they roam around- if they bump into something, theres a wheel underneath that changes its direction. So its never stuck in the corner. My son has dropped them a few times and the dinosaur head came off the "car" base but it snaps right back on.