What is the peephole diameter required for mounting the doorbell? Eques June 14, 2017 23:43 Updated The peephole diameter range is 0.55 - 1.97 inches. It fits most standard peepholes. Related articles Does VEIU have to run on battery power or can it be hardwired to replace the current doorbell and run off that? Will VEIU tie into an existing doorbell? Will there be an option to purchase a longer ribbon cable connecting the doorbell camera and the LCD monitor for those installing on the wall instead of the door? How is VEIU installed? Is the battery in the unit replaceable when at some point it no longer holds a charge? Comments 0 comments Please sign in to leave a comment.