0ur opinion: :Get ready to rock with Sony's MDR-lF240RK Wireless Stereo Headphones System! This complete kit which includes a Transmitter and Headphones offers features like its lightweight, open-air design, 30 mm Drive Units for deep bass, up to 60 hours of battery life with an optional alkaline battery or up to 35 Hours of Battery Life with the supplied NiHM Rechargeable Battery, and a Transmission Range up to 24 feet. Also utilize the Transmission Coverage Angle - up to 90 degrees. Permitting an easy connection to your home audio system, TV or VCR, the MDR-lF240RK provides a personal entertainment experience you can move to.
:The Sony Wireless Headphone System has everything you need to enjoy your music without wires: a high-powered transmitter/recharger, headphones powered by a rechargeable battery, a connecting cable, a UniMatch plug adapter, and an AC power adapter. The system easily connects to TVs and VCRs as well, letting you turn up the volume while people nearby are sleeping or wanting some quiet time. The system has a maximum range of 24 feet and a transmission angle of up to 90 degrees, and lasts up to 35 hours on a full charge. The open-air design of the headphones lets in ambient sound. You can recharge the battery by placing the headphones on the transmitter.
Volume control is provided in one earpiece that adjusts volume for both channels, ferrite magnets ensure the ample production of sound, and a self-adjusting headband automatically adjusts to your head's shape for maximum comfort. The system automatically turns on when you put it on your head, so there are no cumbersome switches or buttons to flip on.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* SONY Wireless Headphones Solve Problem ...
The MDR-IF240RK Wireless Headphone System has made it possible for me to enjoy DVDs and our DVR with a normal sound setting while the mute button is pushed to keep the house quiet for sleeping family members. For years I have had to regulate the sounds to avoid disturbing others. What a difference! It was worth the expense and easy to install by myself. Great product.
Buyer's feedback: 
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Not worth it-buy something else...
These headphones had a lot of static and the range was ridiculously low. I had a set of Philips before these where the headphones were top-notch, minimal static, very sturdy and stayed on my head. I'm a smaller woman and I can't get these Sony things to stay on my head at all. They slide all over the place and fall of constantly. They are very lightweight, but it doesn't matter because you can only sit in one place and not move your head at all or they fall right off. I'm going to return them as soon as I find a good replacement. They do keep their charge a long time though. As a side note don't buy Best Buy's product Rocketfish. They shorted out and broke in 2 weeks. They didn't have much less static then these Sony headphones. I think I am going to have to spend a lot of money to buy a decent pair. I wish I could find those Philips headphones again. One good feature is that they have the volume control on the headset. This is essential I think when buying wireless headphones.
Buyer's feedback: 
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* Sony MDR-IF240RK wireless headset ...
I have found that the head phone works very well within my room, but it will not penetrate walls, but that is something that I overlooked when I was getting ready to buy the headset,So I have only myself to blame for that, So I am giving the headset a very good rating for sound and quality for the price that I paid for it.
Willie G.
Buyer's feedback: 
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owner
Do not use this product with a plasma TV due to the (very loud) static you will hear when any bright image appears on the TV.
Buyer's feedback: 
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* Nice Solution ...
This rechargeable headset from Sony is a great solution to the dilema of having a spouse watch TV while you are trying to sleep. No need to be inconsiderate or start a new and unnecessary argument, just set the TV on mute and turn on your headset. This allows couples to not "let the sun go down on your wrath."
You can trust Sony for quality and innovation.