Features:
Plug and Play
High Quality microphone, fine sensibility
Small, lightweight and portable design with jack cover
No battery is required

Compatibility:
iPhone 3G (need to install recording software, like, iTalk Recorder or Easy Recorder)
iPod touch 2G (need to install recording software, like, iTalk Recorder or Easy Recorder)
iPod nano 4G (Plug & Play)
iPod classic 120G (Plug & Play)