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first of all I'm Hungarian so sorry for the mistakes. If you want to play whit your cat ,you can use this. Its easy so you can make ...
the materials -some Lego blocks -laser module -battery case whit two AA batteries -plastic tube (short)
grab the negative pole and place it to the spring fix it correctly. insert the positive to tho gold coloured something (its marked on the picture)
grab the Lego blocks and build a case that enough wide,tall etc. important! the circuit can be placed in the case
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