The Perfect Sound 1 is an exemplary source for streaming audio to the listenerís ear without the disruption of outer sources. Its closed leatherette ear cushions serve as maximum isolation to reduce sound other than the audio being played by the headphones. The domed enclosure helps to amplify and enrich sound from the 40mm cobalt magnet speakers. Located halfway down the headphones cord is the base unit that houses the AAA battery; it also contains the volume control, power and mute switches. Its battery life lasts up to 60 hours, assuring continuous life so that replacements donít become an annoyance. This comfortable and lightweight (180g) headphones is adjustable and collapsible, making it perfect for storage. Also included is a carrying bag and an airplane audio adapter, ideal and convenient for travel. Compatible with any audio system that has a headphone jack (iPod, MP3, computer and stereo systems), the Perfect Sound 1 is an optimum choice for listeners that enjoy the intimacy of music in their own privacy.