Katie Fehrenbacher explains the concept behind ecoATMs:

Ecoatmimage4You drop off old electronics at one of these machines; it calculates their value, then pays you on the spot, in cash or coupons. The company says its secret sauce is the kiosks’ ability to automatically estimate using electronic and visual techniques a price of the unwanted items that will give consumers an immediate financial incentive to recycle 
at the station.

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