4M Green Science Electro Torch Kit – DIY Dual-Powered Flashlight with Hand Crank & Gravity Light – Educational STEM Toy for Kids Ages 5+ – Build & Learn Renewable Energy Concepts at Home or School

Quite light but great for learning

Not so well made. But for kids it’s perfect. For the price I would says it’s worthy.

Very good , working perfectly

This product is very affordable but also very effective to demonstrate the functionality to your kids. I had some issues on setting up clock time but its not really important, as the idea of making a battery and making clock tick is more important

This was a little disappointing. Dad had to do nearly all of it as the screws required a power screw driver to get them in. Our son effectively watched it being made. Also it’s odd that a solar robot required a battery!

This was a bit of fun at Christmas. It works really well. The only frustration is that the clock immediately turns off when the wires/potatoes become disconnected and you have to reset the time. Would be good if the clock could hold a charge somehow so you had time to reconnect the wires and/or potatoes without having to reset the time. A small grumble.

Used this to demonstrate wind power for Cubs/Scouts. It worked perfectly as shipped, but I actually soldered the electrical connections and assembled the generator block to keep it simple for the younger ones.

Lame design. I purchased 4 sets for an 11 year olds party and had 4 groups of 3 making the sets. Only 1 managed a good launch. The set requires tiny screwdrivers which could have been avoided with better design and using your own tape instead of the impossible to separate double sided in the kit. It doesn’t work with all sizes of plastic bottles and you actually need 2 for each rocket, not clear on box. Also the rocket isn’t a clear tube as it appears on the box it is actually rolled up paper. I could design a better kit than this.

My daughter has had a lot of fun playing with this. Once put together she was out there for an hour trying to get it higher and higher.Great learning toy. Fun to put together