AUDIO

A headset (Plantronics or Logitech or Microsoft are recommended brands and if you have the option, go for the USB plug – not essential but they tend to be more compatible and easier to install); here is a link to the Plantronics http://www.goelectronic.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=PLANTRONICS+AUDIO-470

Or a more expensive but excellent solution for audio is a speakerphone such as http://www.goelectronic.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=PHOENIX+AUDIO+DUET+PCS

What is NOT recommended is a separate microphone (such as built in to a webcam).  A separate microphone and speakers (which again are NOT recommended) as distinct from the recommended headset or speakerphone will create echo and/or feedback in the classroom.

A USB connected device is not a hard requirement – they are just simpler to hook up in some cases.

VIDEO

A webcam -- Logitech again is a recommended brand; here are some models at varying price range in increasinq quality

http://www.bestbuy.com/site/Webcams/cfcat/pcmcat170900050018.c?id=pcmcat170900050018

http://www.bestbuy.com/site/Logitech+-+WebCam+Pro9000/8380593.p?id=1179165373906&skuId=8380593&st=logitech%20webcam&cp=1&lp=1

http://www.goelectronic.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=LOGITECH+960-000048

Of course you can find these and other brands at many outlets and the site provided is one of many online order houses.