Sonoline B fetal Doppler ladies 🤔🤔🤔🤔🤔🤔

So today I ordered sono line b fetal Doppler I'm 21weeks 4days my placenta is anterior but I do feel my baby now for the last few weeks and more and more as day pass, but I felt I would like to know for myself whenever I want to hear it or my fiancé or even family Members are dying to hear our baby heartbeat would be soooo nice. Has anyone had this and loved it, and exactly how do I use it without making myself a nervous wreck. Thanks ladies😊😊