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I bought these Headphones about 5 years ago and had stopped using them about 4 years ago!
The headphones are powered on by a strap that gets pushed up when you put them on. This is quite a clever design and saves on the battery life because they also power off as soon as the strap's position is reset.
Charging is done by placing the headphones on a charger which doubles up as a stand and keeps them tidy. This charger is plugged into the mains and so the headphones are constantly topped up. This is fine but it is actually quite tricky to get the headphones in place to commence charging. The charge stand has a small metal loop that sticks up and connects to underneath one of the ear pieces. The problem is that the headphones don't 'click' into place and so lining them up can be quite tricky This means that any slight movement stops the charging and is actually quite irritating.
My main gripe would be that the sound quality is very poor. This is due mostly to the fact that they are incredibly hard to tune it. The signal has 2 channels and a tuner knob as well as a noise filter and never did I get a combination of these things right to give me a clear sound. It would be good but then any miniscule movements of my head would bring the static back. During the time that I was using this product I moved house which means the chances of a neighbours equipment interfering was greatly reduced. I also used the headphones with a variety of different devices and in a number of different places so I believe that the problem was with the product rather than location or anything environmental.
Sony's worldwide reputation for creating unique, attractive, high-quality, advanced technology products rests on a long line of innovations embraced by people from all walks of life. With a diverse product lineup serving a variety of lifestyles and industries, Sony continuously strives to introduce new products and technologies to meet changing market needs.
RF wireless headphones;
Auto-rechargeable function by placing the headphones on the standing transmitter;
Battery playback time is up to 18 hrs with rechargeable batteries or 28 hrs with Sony Alkaline batteries;
Volume control on headphones;