Beautifully made and lots of fun!
This device is beautifully made and lots of fun.  There are some things you need to know, though...  It uses a rechargeable lithium battery, number 18650, but it does not come with a battery.  (Perhaps because shipping is more difficult with a lithium battery?)  What's worse, I found that some 18650 batteries do not work with it.  The first one I got was actually too big to fit (a little bit too long).  The second one just didn't work, for reasons unknown.  When it didn't work, I emailed a few times with the seller.  He said that sometimes taking the battery out and then putting it back in would solve the problem.  It didn't for me, but I mention it because maybe it will help someone else.  Then he suggested trying a different battery, so I tried again and the third battery worked!  So I can tell you that, for me anyway, a Tanuoyi brand 18650 battery worked.  I can't say anything about how good those batteries are, but at least they work in this device -- and it is so much fun to watch!<br /><br />Another thing I wanted to mention is that a USB charger cable is included with the device, but not the charger brick, so you have to use your own charger.  I've been just plugging it into a USB port on my computer; it takes several hours to charge fully.  Something less than ideal is that the charger connection is on the bottom of the device, so you have to tip it on its side to charge it.<br /><br />Lastly, be aware that, as of spring 2022, there is a backlog, so it takes a while to get one.  I ordered mine on March 11 (through Etsy, not Amazon) and received it on May 11.  It might be taking more time or less time when you are reading this.  I think it was worth the wait (and the additional week it took me to finally get a working battery.)
Rating: 4 stars