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My son loves to press any button in the house. And now he got a sensational Christmas present built by his grandpa (http://zulla.net): A box with buttons and cables that beeps and boings, lights up in different colours and includes a little game of counting lights. Vandalism safe for a 2½yr old, built-in battery charger and (to top it all off) includes an Arduino circuit that I got the source code for so that we can add more effects.
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