Wireless headphones provide freedom to roam without being encumbered by cables, and may be in-ear, over ear, or on ear designs. Wireless technologies are getting better sounding all the time, but you may pay a bit more for wireless headphones compared to their wired counterpart.
- Bluetooth is the most common wireless transmission in smartphones and tablets, and nowadays Bluetooth is fairly good quality and essentially noise-less thanks to it's digital-based signal transmission.
Radio frequency (RF) systems are usually 900 MHz FM analog transmission and can reach throughout a typical home; however, as you get farther away from the base station transmitter you'll hear more "hiss" in the audio. One of the clearest and best sounding wireless systems employs 900mHz FM digital transmission. As long as you stay within range, the audio remains clear but as you move out of range the signal can start to waver.
KLEER™ full CD resolution (uncompressed) audio transmission, used by Sennheiser and a few other manufacturers, is one of the best sounding wireless methods we've heard.
DSSS digital schemes, employed by Sony and other makers, is also one of the best wireless transmission methods HeadRoom has come across.
Infra-red systems use invisible red light like a TV remote control; they are limited to one room and line-of-sight reception and typically suffer from poor audio signal quality.