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User manual Logitech G635 (English - 283 pages)
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Logitech G635 Wired Gaming Headset for PC Black/Blue 981-000748 - Best Buy
Logitech G635 7.1 Lightsync Gaming Headset Stereo Mini phone 3.5mm Wired 5 Kilo Ohm 20 Hz 20 kHz Over the head Binaural Circumaural Cardioid Uni directional Microphone Black - Office Depot