Sony MDR RF-4000K Wireless Heaphones

Sony MDR RF-4000K Wireless Heaphones 


Differences in details 40mm drivers deliver deeper bass, lower distortion and wider dynamic range. Battery life for extended viewing The supplied rechargeable NiMH battery lets you enjoy up to eight hours of continuous on a single charge1. The slim, folding design fits snugly into the charger (included). Substituting a single AAA battery for the rechargeable NiMH pack provides 10 hours of power. Listen from a distance Radio Frequency (RF) transmission sends signals from the transmitter to the headphones, allowing high fidelity sound reproduction. You can enjoy the accompanying reception range ??? up to 100 feet ??? even when you move outside the line of sight of the transmission. Stay comfortable as long as you listen A wide, self-adjusting headband distributes the headphone's weight over a wide area, reducing pressure and improving comfort.Footnotes: 1. Actual battery life may vary based on product settings, usage patterns and environmental conditions.


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[Oct 17, 2018]


The sound is just incredible. Being RF instead of IR You easily get 100+ feet in range. Without loosing any quality. So I sometimes go outside to enjoy the music in the garden. Only Stax does a greater job, but they are at least the double in the asking prices. The comfort is very good, but can be a little hot in the summer time.


The earpieces are made of a fabric that doesn't add up to the original price. It simply starts to crack and dust away over time. It's why they don't get five stars. Not something You expect from a premium product. I have had cheaper headphones for years not having this issue.

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