Is Findster Duo free of monthly fees? Jane Jonson Updated January 13, 2017 15:38 Follow Yes, Findster Duo is free of monthly fees and doesn’t requires cell coverage or SIM card. Related articles Is the Findster Duo App compatible with my smartphone/tablet? 8. LED color meaning In which countries can I use Findster Duo? Guardian or Child module remains illuminated (blue light) Remote monitoring Have more questions? Submit a Request Comments 0 comments Please sign in to leave a comment.