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 Findster Duo App compatible with my smartphone? 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.