Overview:

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.

Features:

• 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 charge. 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.
• 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.
• 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.

Specifications:

Weights and Measurements:
Weight (Approx.) : Approximately 300 g (10.6 oz) (including supplied rechargeable nickel-metal hydride battery)
General:
Input Jack : Phono jacks (left/right) Stereo mini jack
General Specifications:
RF Carrier Frequencies : 2.404 GHz - 2.476 GHz
RF Modulation : GFSK
Range : Approximately 100 feet (30 m)
Audio:
Distortion : 1% or less (1 kHz)
Driver Unit : 40 mm, closed
Frequency Response : 10 Hz - 22,000 Hz
Infrared Carrier Frequencies : 2.404 GHz - 2.476 GHz
Power:
Battery Charging (Approx) : 15 hours
Battery Life (Approx) : 8 hours
Battery Type : AAA Ni-MH x 2
Input Voltage : DC 5.2 V (from supplied AC power adaptor)
Power Requirements : Rechargeable nickel-metal hydride battery (supplied) or commercially available (size AAA) alkaline batteries

In the Box:

• BP-HP550-11 (550 mAh)
• Stand
• AC power adaptor (5.2 V)
• Connecting cable (stereo mini plug - pin plug × 2), 1 m (39 3/8 in)
• Card warranty
• Rechargeable nickel-metal hydride battery
• Unimatch plug adaptor (stereo mini jack - stereo phone plug)
• Operating Instructions (this manual)