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Sony MDR-RF4000K

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Written by Paul Strauss | March 15, 2010
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Available 4/2010: Sony’s MDR-RF4000K is a digital cordless headphone with circum-aural cushions and 40mm long-stroke diaphragm; it’ll last up to 7 hours and includes a charging dock.

Sony MDR-RF4000K

Sony MDR-RF4000K

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Sony MDR-RF4000K

Sony MDR-RF4000K

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