Sony MDR-RF4000K Digital RF Wireless Headphones

General Features:

• Wireless Lightweight Isolating Stereo Headphones
• Enclose-ear, Circumaural design for superior sound isolation
• Massive 40mm drivers produce engulfing bass and flawlessly performs in higher frequencies
• Up to 100ft range radio frequency (RF) transmission from the source for a completely liberating experience
• Wide, self-adjusting headband makes for a lightweight feeling for comfort throughout extended periods of use
• Ear enclosures are durable and secure for long-lasting private musical enjoyment that prevents sound leakage
• Can be powered with an included rechargeable nickel-metal hydride battery or AAA commercial battery
• Great for computer gaming, Skype, etc
• Includes different size tips for added comfort
• 1-year Manufacturer's Warranty
• In the Box
• One 5.2V AC power adapter
• One connecting cable (stereo mini plug - pin plug × 2), 1 m (39 3/8 in)
• One card warranty
• One rechargeable nickel-metal hydride battery
• One Unimatch plug adaptor (stereo mini jack - stereo phone plug)
• One operating instruction manual
• One stand
• One BP-HP550-11 battery

Product Specifications:

• Frequency Response: 10-20,000 Hz
• Rotary volume control
• Effective Range: Approximately 100Ft
• Battery Charging(Approx): 15hrs
• Battery Life (Approx): 8hrs
• Transmitter: 2.404GHz - 2.476GHz
• Distortion: <1%
• Communication: wireless digital 2.4Ghz radio frequency
• Magnet Material: Neodymium
• Speaker Diameter: 40mm