Q. Is using an image baby monitor, without voice the same as a voice monitor, or one can be more lenient?
A. See question above in regard to a voice monitor. Horav Shlomo Miller’s opinion is that there may be a greater possibility to be lenient, since no “hashmoas kol” or creating laud noises during Shabbos are involved (“hashmoas kol” is prohibited because it constitutes a weekday activity or “uvdin d’chol,” – or a “Ziluzo DeShabbos,” a disregard to the holiness of Shabbos. Shulchan Aruch and Mishna Berura 252: 5 – See Ma’ayanei Shlomo 41). In the case of a muted image monitor, no voice is transmitted.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a