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Mad Catz F.R.E.Q. 4D Stereo Gaming USB Headphones + Microphone PC/Mac/XBox/Smart 728658040833 | eBay
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Mad Catz reveals the F.R.E.Q.7 surround sound gaming headset for Windows PC and smartphones. - Polygon
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Mad Catz F.R.E.Q.9 Wireless Surround Headset with Bluetooth Technology for PC, Mac, Android, iOS, Apple iPhone 7, Smartphones, Tablets, and Gaming Consoles - Newegg.com
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