I’ve still have a Corona Helicopter that I purchased a couple of decades ago. **** scary if you’re not very careful as it has some very large heli blades. It was billed as a crash proof because the blades would fold if it hit something. I recently turn in the batteries to a recycle center as it’s been too long to trust the batteries to charge. It was a lot of fun and I’m glad I bought it for the experience, but it now sits on my RC shelf. Be careful, just a friendly reminder of the danger it can pose.