• RF wireless headphone system using FM transmission system
• Up to 150-foot transmission range with manual frequency tuning/reception
• Lightweight closed-type headphones with 30 mm drive units for deep bass; volume control on headphones; automatic on/off headphone function
• Self-adjusting headband for precise and comfortable fit
• Up to 28 hours battery life using 2 AAA batteries; includes 2 NiMH rechargeable batteries with up to 18 hours' use

SONY MDR-RF920RK -- Free your listening experience from the ties that bind, with this superb 900MHz RF Wireless Headphone System. For working out, cooking, cleaning, or entertaining oneself while housemates slumber, these headphones are unbeatable! Includes rechargeable NiMH batteries -- Up to 28 hours battery life Charging automatically when headphones are on the base Three available transmission channels Automatic Power On / Off Volume control on headphones Easy connection to home audio system, TV or VCR Frequency response - 20Hz - 20kHz Sensitivity - 105 dB/mW Package includes NiMH battery, AC adapter, 9V connecting cord, UniMatch plug adapter Transmitter dimensions - 4.9H x 5.25W x 5.35D Battery Life - Approx 18 hours with fully charged Ni-MH battery (included) / Up to 28 hours with optional AAA Alkaline type batteries

These have both good sound and reception, you just need to make an effort adjusting on the right channel. Use good quality cable between source and base to eliminate noise. Range can be very good, depending on where you put the base station (away from tv and other electronics). Battery life are long, even after not seeing any use for a couple of months and not connected to mains it works. Well worth 100$ I guess. Sound quality that are a bit "tighter" than a Grado sr-60 headset.

this is worst ever headphones. you may not get clear sound even 1 meter from a base. I bought Sennheiser in a same price range and it is much better.

I bought this as a refurbished. It was quite good peice, but it has weak noise. I don't know whether it's because of refurbished one or its nature.
Even weak noise makes me annoy. So, I gave up using this product.

Over the past 10 or 15 years I've probably owned 10 different wireless headphones. The latest type I've tried is a Jabra A120s Bluetooth Music Adapter/Motorola stereo headset. They all have the same problem. To many wireless devices operating on to few frequencies. I thought I might get away from this problem using a digital device (Jabra,Motorola). The problem with Bluetooth is very short range. I find inside my house just stepping into another room not more then 10 feet away causes this system to become very intermittent (the sound goes on and off all the time). If you stay in the same room, I would say this is by far the best system. But if your like me and you want to move around wearing wireless headphones the Sony MDRRF920RK 900 MHz Wireless headphone is the best one that I've tried. I would say I can go about 75 to 100 feet away from the transmitter before I loose reception. All the others I've tried are constantly going out of tune and blasting you with static. That's not to say this will never happen with the Sony, I'm just saying it happens allot less often. There's no manually tuning with these. If it does go out of tune all you have to do is lift the headphones off your head for a second, put them back on and they will automatically re-tune themselves. Another thing I like about these is that there's no on/off switch. When you take them off, they turn off, when you put them on, they turn on and that saves battery life. I would agree with other reviewers regarding the battery charging system not being very dependable but as I said previously I've used wireless headphones a long time and I've found that the rechargeable batteries have such a short life that I gave up trying to be green and went back to Duracell Alkaline batteries. The reason I added "unfortunately" to the end of this review title is because I'm still hoping for a wireless headphone that won't have radio interfearance problems from other wireless devices (they all have some hissing and buzzing at times due to this) and at the same time have a reception range thats allot greater then 10 feet that bluetooth offers.

Excellent headset, very light-weight and comfortable. Clear sound. Having had wireless headsets off and on over the years, and purchasing this one after wearing out my IR, I pretty much knew what problems to anticipate. These use the same frequency range as old cordless phones, no problem, got 2.4GHz so not an issue. The sound output is also very dependent on how much sound you can crank out at the source; no problem either, have it hooked up to my amp; with the volume halfway cranked it has plenty of power for very clean and vibrant sound. Docking for charging is a little weird, but just slapping it on the station and rotating it slightly seats it and there is a clear indicator that it's seated correctly when the charging light turns green. Another nice feature is the ability to use standard triple-A batteries as a backup. Overall, a great product. Dinged it a star because of the proprietary rechargeable batteries.