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and where can i buy the heads. its not very clear on the picture but the lower left slot is + and the top is negative. If its attached to a 120V in, 24 V 70 W out AC power adapter thats even better.

Picture

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OMG! A 5 Mpixel image with 95 % background. A good thing that Olin's out of town. – stevenvh Aug 9 '12 at 19:25
A clearer photo would help. And please include something to give it a sense of scale! A ruler, or a penny, or something. What is it for? – Grant Aug 10 '12 at 4:11

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