> > My guess is an incandescent bulb on one end and an LDR on the other. > N'est-ce pas? > The optos I've pulled from answering machines have been neon/LDR combos. _________________________________________________________________ Get the power of Windows + Web with the new Windows Live. http://www.windowslive.com?ocid=TXT_TAGHM_Wave2_powerofwindows_122007