These are wireless headphones with an on-ear, open back design. The charging base/transmitter has an analog connection so these will work for many old devices as well as most new ones.
SpecsUpdate
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Pros
Pro Clear highs, warm and forward mids with powerful bass
These headphones have a pleasant sound signature. The highs are clear and have good detail, without becoming harsh. Mids are forward and natural sounding. The bass is powerful. However, it can also come off as bloated. The good thing is that the bass quantity does not muddy up the whole sound signature.
Pro Analog connectors ensures wide compatibility range
Instead of fancy wireless standards or next generation connections, the base station features an RCA connection which allows these headphones to work with a wide range of TVs and old school media players. These headphones can also be used with computers and laptops as these come with adapters that can convert the RCA connection into a 3.5mm connector.
Pro Headphone stand functions as charger
The stand has contact points which match those on the headband. This allows the stand to supply power to the headphones for convenient charging.
Pro Internal batteries can easily be replaced
Instead of using sealed, proprietary batteries, these headphones use standard AA batteries which can easily be removed from one of the ear cups. This makes replacing them convenient when they are not able to effectively hold their charge.
Cons
Con Some hiss may mix with your music
Some users report that a fair amount of hiss can be heard from these headphones, which can be quite distracting/annoying. A possible fix would be to make sure that the source audio is at full, and that you will only control the volume from the headphones' volume control knob on one of the ear cups.
Con Can be uncomfortable after hours of use
The RS120 has an on-ear design. Combined with the rather thin padding used on the ear cups which are also a bit too soft, these headphones can put quite a bit of pressure on the ears, which can make them quite uncomfortable to wear.