This is a small size power supply with low cost and easy to make that only taking about 5 more hours. I was very happy with it and would share with you.Power Supply SpecificationsInput: 5v-16v/3A DCOutput: 1.3V - 15.5V/2 Amps
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Cool Mini Kart Style Accessories Kart Car Syle Holder for 6.5" 10"Two Wheel Self Balancing Scooter Hover Boards, Not Noly STAND,Can be LIKE A GO-KART http://www.safetygearhq.com/product/trending-products/hoverboards-monowheels/cool-mini-kart-style-accessories-kart-car-syle-holder-for-6-5-10two-wheel-self-balancing-scooter-hover-boards-not-noly-standcan-be-like-a-go-kart/
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DIY Portable Stereo - Album on Imgur
Just put a car stereo in a box with a 12v battery and set of components with the cross over... done.. this one is fancy, has a light, a remote, voltmeter, and it will hold a few tools... Probably loud too..