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Product Packaging:Standard Packaging Product Description Go wireless with your music. The MDR-IF240RK wireless stereo headphone system features 30mm drive units for deep bass, up to 30 hours of battery life on a single charge, and a transmission range up to 24 feet. Permitting an easy connection to your home audio system, TV or VCR, these headphones provide a personal entertainment experience you can really move to. Amazon.com Go wireless with your music. The MDR-IF240RK wireless stereo headphone system features 30mm drive units for deep bass, up to 30 hours of battery life on a single charge, and a transmission range up to 24 feet. Permitting an easy connection to your home audio system, TV or VCR, these headphones provide a personal entertainment experience you can really move to. Go wireless with your music. Click here for a larger image Transmitter offers a 24-foot range, for listening enjoyment throughout the room. 1/4-inch adapter included. Go Infrared Infrared transmission works by sending out infrared light signals from the transmitter to the headphones. Infrared signals are resistant to external noise and interference, but the headphones must be within line of sight of the transmitter–the signal can’t pass through walls, furniture, or other obstacles. That said, these phones offer a 24-foot transmission range, for listening enjoyment throughout the room, and a 90Â° transmission angle (maximum) for uninterrupted listening as you move around. A convenient mute function lets you temporarily suspend audio, and the simple controls include an automatic power switch and single volume control. Lightweight, Comfortable Design Wear the MDR-IF240RK phones comfortably for hours on end, thanks to a lightweight construction, wide headband, and open-air design that lets you continue to hear ambient sound. Powerful Sound 30 mm diameter drive units deliver serious bass, and a wide dynamic range. PET diaphragms ensure high rigidity, which minimizes distortion, even at higher volume levels. Ferrite magnets combine high energy and small size, for ample sound output without weighing the headphones down. Great Battery Life The included NiCad rechargeable battery automatically recharges when you place the headphones on the supplied transmitter. Get up to 30 hours of life on a single charge, or switch to an optional AA alkaline battery for 100 hours. MDR-V150 Specs Frequency Response: 18Hz – 22,000Hz Driver Unit: 30mm Magnet Type: Ferrite Diaphragm: PET Effective Range: 24 ft (7m); 10 ft (3m) at +/-45Â° Infrared Carrier Frequencies: Right 2.8MHz, Left 2.3MHz; (Frequency Modulation) Power Requirements: AC 120V, 60Hz Recharging Time: 24 hours (Approximate) What’s in the Box MDR-IF240RK Headphones, Transmitter/Recharger, Rechargeable Battery, Connecting Cable, UniMatch Plug Adapter, AC Power Adapter