Ports & interfaces
| Frequency band |
2.4 GHz |
| Wireless range |
30 m |
Headphones
| Headphone frequency |
10 - 22000 Hz |
| Driver unit |
40 mm |
| Wearing style |
Head-band |
| Ear coupling |
Supraaural |
| Acoustic system |
Closed |
| Magnet type |
Neodymium |
| Driver type |
Dynamic |
| Total Harmonic Distortion (THD) |
1% |
Additionally
| Wireless technologies |
Wireless |
2.4GHz Digital RF Wireless Headphones
Unplug and enjoy. The MDR-RF4000K digital wireless headphones system gives you the freedom to travel up to 100 feet from your sound source while delivering phenomenal sound. This system includes Ni-MH rechargeable batteries, 2.4GHz RF digital transmission and headphones with a 40mm driver for deep bass. Includes charger and ultra-long battery life.
<b>Differences in details</b>
40mm drivers deliver deeper bass, lower distortion and wider dynamic range.
<b>Battery life for extended viewing</b>
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.
<b>Stay comfortable as long as you listen</b>
A wide, self-adjusting headband distributes the headphone's weight over a wide area, reducing pressure and improving comfort.
<b>Listen from a distance</b>
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.
