Product Description

Get ready to rock with Sony's MDR-IF240RK 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-IF240RK provides a personal entertainment experience you can move to.

Product Details

• Brand: Sony
• Model: MDRIF240RK
• Original language: English
• Dimensions: 3.25" h x 9.25" w x 10.00" l, .28 pounds

Features

• System has 24-foot range and lasts up to 35 hours
• Simple battery recharging
• High-powered ferrite magnets generate superb sound
• Weighs 6.3 ounces

Amazon.com Product Description
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.

From the Manufacturer
Get ready to rock with Sony's MDR-IF240RK Wireless Stereo Headphones System! This complete kit which includes a transmitter and headphones offers features like a 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 of up to 24 feet. Also, utilize the transmission coverage angle--up to 90°. Permitting an easy connection to your home audio system, TV or VCR, the MDR-IF240RK provides a personal entertainment experience you can move to.

Features:

 
• Cordless Design lets you move around the room and still enjoy music or TV sound tracks; lets you turn the volume up late at night--without disturbing anyone else
• Easy Connection to TV, VCR, and audio systems, through the supplied connecting cord and plug adapter
• Light Weight so you can wear them comfortably for hours on end
• Open-Air Design lets you continue to hear ambient sound
• High-Power Infrared Transmitter incorporates multiple light-emitting diodes (LEDs) for extended coverage range
• 24 Foot Transmission Range for listening enjoyment throughout the room; lets you sit back from the TV set and still enjoy TV sound
• 30 mm Diameter Drive Units are larger than many portable headphones for deeper bass, lower distortion and wider dynamic range; frequency response extends down to a low 18 Hz
• Rechargeable Battery (supplied) saves repeated trips to the store; automatically recharges when you place the headphones on the supplied transmitter
• Up to 100 Hours of Battery Life with optional AA alkaline battery; up to 30 hours life with supplied rechargeable NiCad battery
• Complete Kit including high-powered transmitter/recharger, headphones, rechargeable battery, connecting cable, UniMatch plug adapter, and AC power adapter
• 90° Transmission Angle (maximum) for uninterrupted listening as you move around the room
• PET Diaphragms ensure high rigidity for minimum distortion; low mass for extended high-frequency response out to 22,000 Hz
• Ferrite Magnets combine high energy and small size, for ample sound output
• Wide Headband with a separate self-adjusting band conforms precisely to the curve of your head; stays comfortable, even after listening for hours on end
• Mute Function to avoid noise through the headphones; cuts out the sound when no audio signal is available
• Automatic Headphones Power Switch conserves battery life; the headphones turn on when you place them on your head
• Single Volume Control in one earpiece conveniently adjusts the volume for both channels
• Supplied Connecting Cord with Sony UniMatch plug that goes to the headphone output of your high fidelity system, TV set or VCR; UniMatch system accommodates either the phone jack on high fidelity components or the minijack found on video components
• Infrared Modulation: Frequency modulation
• Infrared Carrier Frequencies: Right 2.8MHz, Left 2.3MHz
• Transmitter Power Requirements: AC 120V, 60Hz when used with supplied AC power adaptor, which connects to the DC 9V jack
• Audio Input: Stereo L/R phono plugs; supplied 3-foot connecting cord goes from stereo mini plug or phone plug to L/R phono plugs
• Effective Range: 24 feet (7 m); 10 feet (3 m) at ± 45°
• Power On/Off: Automatic On/Off switch
• Headphones type: Open-air, dynamic, Cordless
• Headphones drive unit: 30 mm
• Headphones diaphragm: PET
• Headphones magnet: Ferrite
• Headphones frequency response: 18 - 22,000Hz
• Battery Life: Approx. 35 hours with optional NiCad battery; approx. 60 hours with optional alkaline battery
• Recharging Time: Approx. 24 hours
• Headband: Wide, self-adjusting
• Power On/Off: Automatic switch
• Volume Control: One
• Weight: Headphones: 6.3 oz. (180 g) (including battery), Transmitter: 4.4 oz. (125 g)
• Supplied Accessories: Rechargeable NiCad battery NC-AA-HJ, AC adapter, connecting cord, UniMatch plug adapter

Customer Reviews

Worth the price
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. They are fairly comfortable, but if I tilt my head, they will fall off because the foam cushions are flat rather than cupped like the Sennheiser and the headband is rather flimsy. That would be my biggest complaint. Sony should also have provided a longer cable for the transmitter to allow more flexibility in placement. Sound quality is fine for TV viewing, but it can't compare to the quality of a wired headphone like the Panasonic which makes you feel like you're actually in a movie when played on DVD.

I have perfect reception using it at 12 feet and I've walked 45 degrees to the left and right without any loss. If something comes between the headphone and the transmitter, it will cut out, so positioning is very important. You can eliminate the hiss that others have mentioned, if you turn up the volume on the sound source (e.g. TV or Receiver) rather than turning up the volume control on the headphone. On the Sennheiser there was a tuning control, which I had to fiddle with in order to receive a signal, but the Sony doesn't have or need one.

In conclusion, this headphone met all my expectations, the price was reasonable and I would recommend it to others until someone comes out without something that has better sound quality and excellent battery life.

Sound quality - 4 stars (compared to other wireless)
Battery life - 5 stars
Range - 4 stars
Comfort - 4 stars
Fit and finish - 3 stars
Price - 4 stars

Okay for tv, games, nok for music
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.

Great for TV watching; wish I'd ordered them sooner
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!