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Sony MDR-IF240RK Wireless Headphone System

by Sony
3.6 out of 5 stars  See all reviews (1,152 customer reviews) 21 answered questions

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Product Packaging: Standard Packaging
  • IR wireless system with 24-foot range and 90 degree maximum transmission angle
  • NiCad battery lasts up to 30 hours on a single charge, recharges in 24 hours
  • Headphones feature 30mm diameter PET drivers with ferrite magnet for superb sound
  • Lightweight (6.3 ounce) phones feature open-air design with wide headband for comfort
  • Frequency response: 18Hz - 22,000Hz
There is a newer model of this item:
Sony MDR-IF245RK Wireless IF Headphone, Sony MDR-IF245RK Wireless IF Headphone, 3.7 out of 5 stars (1,043)
In Stock.

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Product Packaging: Standard Packaging
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Technical Details

Product Packaging: Standard Packaging
  • Wireless-Feature

Product Details

Product Manual [511kb PDF]
  • Product Dimensions: 12 x 8.5 x 4.2 inches ; 2 pounds
  • Shipping Weight: 2 pounds
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B000095SB4
  • Item model number: MDRIF240RK
  • Average Customer Review: 3.6 out of 5 stars  See all reviews (1,152 customer reviews)
  • Amazon Best Sellers Rank:
  • Product Warranty: For warranty information about this product, please click here
  • Discontinued by manufacturer: Yes
  • Date first available at October 2, 2001

Product Description

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.

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.

Sony MDR-IF240RK Headphones
Go wireless with your music. Click here for a larger image
Sony MDR-IF240RK Receiver/Phones
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 90° 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 +/-45°
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

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews
1,159 of 1,177 people found the following review helpful
4.0 out of 5 stars Worth the price June 4, 2004
Package Type:Standard Packaging
This review is on the Sony MDR-IF240R not MDR-IF240RK, not sure if there's any difference. I needed a wireless headphone for the bedroom because I watch TV over 2 hours every night while my wife sleeps and about 2 hours early in the morning. I've also owned a wireless Sennheiser HDR60 and a wired Panasonic RP-HT970 Vibration Series Headphone. The Sennheiser worked fine, but their rechargeable battery (two included) would only last me about two days. I always had one recharging so I could swap it out, but it was still annoying to have it cut out in the middle of a program. After a year one of the batteries wouldn't hold a charge any more and when I saw how much a replacement battery cost, I decided to buy the Panasonic. Because it was wired, the Panasonic RP-HT970 sounded great, especially the bass effects with DVD's. It was very comfortable and I would still be using it, if I hadn't tripped on the cable and broke it. It had also been an obstacle for my wife when she had to walk across the room.
I decided to go wireless again and bought the Sony MDR-IF240R after reading reviews. I wanted a headphone that used standard batteries and wouldn't need constant replacing. I have cordless phones and a wireless PC network, so I decided having no interference using infrared was better than having the ability to go room to room using other technology. Since I only used it for TV viewing, I was willing to accept decent, if not great, sound quality. This headphone met all my requirements. I put in one standard AAA battery instead of the rechargeable battery that came with it and I haven't had to change it in over two weeks of constant use (4 hours/day).
The headphones are mostly plastic and look a bit cheap.
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447 of 460 people found the following review helpful
3.0 out of 5 stars Okay for tv, games, nok for music January 2, 2004
By redblue
Package Type:Standard Packaging
These wireless headphones perform as advertised. Almost. I don't quite get the "24 feet" range but then again all the range I needed and expected was within a standard sized room. The convenience is freedom of movement within the room with decent fidelity to watch late night television or play computer games without distracting others. However the phones have a noticable hiss which is distracting for most music. Also a minor peeve is the plastic bar across the top. The bar is not padded and the phones have built-in springs which force the bar down on the top of your head. Noticably uncomforable for me after a while and I have a full head of hair. The comfort level is okay if you wear the phones draped along the back of your neck (which makes it tough to sit back in a high backed chair or lie down on the couch) or below your jaw (which makes it tough to munch on snacks in that position though). Or you can kludge it to a certain length with some electrical tape. Overall the phones are okay given the price. Just be sure that your expectations match what you are paying. If you want high fidelity and comfort and range, you will be better off paying up for another model.
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172 of 177 people found the following review helpful
5.0 out of 5 stars Great for TV watching; wish I'd ordered them sooner April 7, 2006
Package Type:Standard Packaging|Verified Purchase
These headphones are clearly not intended for listening to music at high quality. But I have been using them to listen to my TV, and am delighted with the ease of setup, ease of use, long battery life, and apparent immunity from interference.

You can't use them outside the room, and the sound quality is good but not great. Perfect for TV. Even if obstacles partly block the infrared path, the sound continues uninterrupted. The headphones are comfortable and light, and run for many hours before recharging.

I am totally satisfied with the product, and only wish I had ordered something like this years ago!
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58 of 58 people found the following review helpful
4.0 out of 5 stars Good Infrared Headphones February 2, 2004
By A Customer
Package Type:Standard Packaging
These are good infrared headphones. Cons: infrared headphones have limited range. Pros: infrared interference has limited range! That is, you don't have to worry about your neighbor creating some signal that interferes with your headphones. Your walls, windows, etc are enough to block the interference. But the downside is that the device has limited field of view (only plus/minus 45 degrees from the stand, although you can rotate the transmitter to point that field of view where you want it). Range is not an issue; the headphones work well 20-30 feet to the back wall of my room. The signal doesn't go through walls so your headphones go silent if you go to the next room. Holding a newspaper or magazine high in front of your face is enough to make the signal cut out, too. Turning your head back and forth doesn't cause any reception problems (except when you turn *exactly* 90 degrees).
But I am very happy to have range and field of view limitations in exchange for interference-free reception. Another reviewer complained about an annoying hiss: this only occurs when you turn your TV down low and then crank up the headphone amplification (this is because the transmitter is then sending out such a small signal that the transmission noise is almost as large as the signal). Simply keep your TV volume high and the headphones amplification low and you will not be able to hear any hiss or static. To my untrained ears, they sound as good as corded headphones.
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81 of 85 people found the following review helpful
1.0 out of 5 stars Poor Quality / Cuts Out August 3, 2007
Package Type:Standard Packaging|Verified Purchase
When I originally purchased this item - I was very happy with it. However as time went on (2-3 months) the headphones would cut out every few minutes. All in all this would not have been terrible except every time it cut out- it would first elevate substantially in volume very quickly before cutting out with a loud "Pop".

I have already returned 2 sets and have had the same issue with all of them.

If they could get this issue worked out- they would be a wonderful product
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