Sony MDR-RF4000K

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Sony announces RF4000K, RF810RK headphones

Sony announces RF4000K, RF810RK headphones

By 15 March 2010

Sony has dropped us word of two pairs of wireless headphones that it'll be releasing in April. There's the MDR-RF4000K, and the MDR-RF810RK, but for some reason the company seems far more excited about the RF4000K, so let's look at those first. The styling... >>


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