2013 Advent Calendar Day 18 Post author:jonathansblog Post published:December 18, 2013 Post category:2013 Post comments:0 Comments the fiber optic microphone these are cool :) Tags: Calendar, Microphone Read more articles Previous Post2013 Advent Calendar Day 17 Next Post2013 Advent Calendar Day 19 You Might Also Like 2013 Advent Calendar Day 5 December 5, 2013 2013 Advent Calendar Day 6 December 6, 2013 2013 Advent Calendar Day 12 December 12, 2013 Leave a ReplyCancel reply