![1: The PowerMate by Griffin Technologies was used as the knob like device. | Download Scientific Diagram 1: The PowerMate by Griffin Technologies was used as the knob like device. | Download Scientific Diagram](https://www.researchgate.net/publication/39066030/figure/fig12/AS:497527297449985@1495631159696/The-PowerMate-by-Griffin-Technologies-was-used-as-the-knob-like-device.png)
1: The PowerMate by Griffin Technologies was used as the knob like device. | Download Scientific Diagram
![Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller. {link removed} for Sale in Walnut, CA - OfferUp Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller. {link removed} for Sale in Walnut, CA - OfferUp](https://images.offerup.com/_qLjnrPKvEix3Hb5H4iekNwzjHM=/1125x938/1563/1563044f9d6448cf84c41c24b2649807.jpg)
Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller. {link removed} for Sale in Walnut, CA - OfferUp
![Griffin PowerMate Bluetooth review: The Griffin PowerMate Bluetooth adds a sleek programmable control knob to your Mac (first take) - CNET Griffin PowerMate Bluetooth review: The Griffin PowerMate Bluetooth adds a sleek programmable control knob to your Mac (first take) - CNET](https://www.cnet.com/a/img/resize/968f11b5c5495a164860fbe3f2fd28bcb41fe162/hub/2014/01/05/e0ef1461-84ca-11e3-beb9-14feb5ca9861/Griffin_PowerMate_large.jpg?auto=webp&width=1200)
Griffin PowerMate Bluetooth review: The Griffin PowerMate Bluetooth adds a sleek programmable control knob to your Mac (first take) - CNET
![Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller. {link removed} for Sale in Walnut, CA - OfferUp Griffin PowerMate Multimedia Control Knob for USB Computers, Black - Assignable USB multimedia controller. {link removed} for Sale in Walnut, CA - OfferUp](https://images.offerup.com/z1HayTgWBuDp6sfHF26Y1D7zRdQ=/250x352/d7b1/d7b140d5bde24174a0b8a7f77f194aac.jpg)