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Razer Opus headphones review: Stellar THX sound for $200 | Engadget
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Razer Opus Review: Magnum Opus for Gaming Audio | WIRED
Razer Opus X Wireless Review - RTINGS.com
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Razer Kraken Ultimate with Active Noise-Canceling Microphone | Razer United States
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Amazon.com: Razer Opus Active Noise Cancellation Headset: THX Certified Headphones - Advanced Active Noise Cancellation - Bluetooth & 3.5mm Jack Compatible - Quick Attention Mode - Auto Play/Auto Pause - Black : Video Games
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Razer Kraken Kitty - Headset - full size - wired - USB - noise isolating - black - Walmart.com
Razer Opus | Forget the Noise - YouTube
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Razer Opus Active Noise Cancelling Headphones “Real Review" - YouTube
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Razer Opus is a set of noise-cancelling headphones with THX audio | Engadget
Razer Peripherals and active noise cancelling (ANC) technologies | Razer United States
Buyr.com | Headsets | Razer Kraken Kitty RGB USB Gaming Headset: THX 7.1 Spatial Surround Sound - Chroma RGB Lighting - Retractable Active Noise Cancelling Mic - Lightweight Aluminum Frame - for PC - Classic Black
RZ04-03760300 - $109 - Razer Opus X - Quartz Active Noise Cancellation Headset