Looking for a pulse sensor like the one in this video

Can anyone tell me what type of IR sensor he used in this video and where I can find one? I have spent hours trying to figure out/find what he used but not having any luck.

Video: http://www.youtube.com/watch?v=BAp1snPchT4


think an IR receiver, see also - http://embedded-lab.com/blog/?p=1671 -