One is this model:
http://www.amazon.com/CPS-Response-Pad-LED-Screen/dp/1881483711

The other is this:
http://www.amazon.com/interwrite-PRS-Model-118-015-001-Transmitter/dp/0118015001/ref=sr_1_cc_1?s=electronics&ie=UTF8&qid=1320849553&sr=1-1-catcorr

Best offer, wife had these left over from some classes last year.

[Edited on November 9, 2011 at 9:40 AM. Reason : will deliver around campus on my way to/from work]

11/9/2011 9:40:15 AM