The MXL Pro-1BD USB Microphone is a plug-and-play solution for improving audio quality on home recordings, podcasts, voice-overs and web communication via Skype, AIM, iChat, etc. The Pro-1B is compatible with both Mac and Windows OS and will operate with USB A or B type connections. There is a 1/8" (3.5mm) monitor output for headphone monitoring and gain controls for volume adjustment are provided. The microphone is USB powered, so there is no need for external power supplies or batteries.