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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
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Very Goods | Amazon.com: Griffin PowerMate Multi-Media Control Knob with Bluetooth Connectivity - Wirelessly control your Mac from Volume to Key Commands: Griffin Technology: Computers & Accessories
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Griffin PowerMate Bluetooth review: The Griffin PowerMate Bluetooth adds a sleek programmable control knob to your Mac (first take) - CNET
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