Over-Ear Headphones Or Circumaural Headphones
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There are broadly 3 ways by which wireless headphones receive their signal:
IR (infrared) — these use a line-of-sight signal and avoid radio interference. They have the disadvantages of short range and reduced mobility (you have to remain within sight of the base station), but they usually do produce a clean sound.
900 MHz — these are analogue radio headphones. The main disadvantage is susceptibility to hiss and other noise, especially when you move your head or move to another room.
2.4 GHz — these are digital radio headphones, like the RS 170, and are more likely to be free from hiss and noise.