Best Buy: Griffin PowerMate USB Multimedia Controller 1100-PWRMTS
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Microsoft Surface Dial evokes comparison to Griffin PowerMate for Mac | AppleInsider
Griffin Technology PowerMate Bluetooth Controller GC37886 B&H
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Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller. {link removed} for Sale in Walnut, CA - OfferUp