Griffin iMic USB Audio Adaptor adds a quality stereo recording input to your PC or Mac.Complete plug-and-play functionality with no required software. Plugs into the USB port. Supports multiple audio formats such as MP3, QuickTime, WAV, and AIFF. Works with most microphones so you can add voice-overs to your iMovies and is perfect for recording your old album collection to digital. Also improves output to your headphones or speakers.Features-Complete plug-and-play functionality-No software required-Plugs into the USB port of a Mac or PC-Supports multiple audio formats MP3, QuickTime, WAV, and AIFF-Works with most microphones-Lets you add voiceovers and music to your iMovies-Perfect for recording your old album collection to digital-Improves output to your headphones or speakersGood shape