Casters lock once. The guide is very clear on this. Once entered, they are forever. Given that there were only 5 of them, I decided I didn't need instructions and clicked the legs first. Then I realized that there was a crossbar between them. And they came out for nothing. Luckily, I managed to bend my legs enough to slip a bar between them and hold them in place. Overall assembly was next to nothing and required no tools. I used a utility knife to cut the 5 pieces of tape holding it closed. When ordering, I somehow overlooked the fact that it looks like a small Vespa. It smells so cute! It was supposed to be quite loud so I changed the setting to a lower one and I like it better. It comes with batteries already installed, but the battery compartment has a screw cap for security. I like the progressive wheel locks best. They offer several levels in the settings from a slight slowing down of the wheels to almost complete blocking. My baby started crawling last week and is getting up this week. I locked the wheels and put them in my son's big playpen and he pushed the buttons a couple of times and then stood in front of it. It's cute, sturdy, easy to assemble and works exactly how I hoped it would. I hope this information was helpful.
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