I have the same exact kind, put it in mode 2 it will always keep changing it never really stays at something because it just kinda guess how many beats per minute. Mode 3 is to just listen to the heartbeat i was wondering about it too n googled it lol. I can't remember what mode one was for though
Oh also idk if you know, but if you find a heartbeat in the 80's or 90's it is yours. Lol i freaked out when i first found mine i was like why is the babys heartbeat so low!! Lol then my fiancee informed me we have 2 major veins running down there on both hips!
Haha yeah sometimes the little booger likes to move around right after you find them lol mine does it to me allllll the time, n actually did it to the doctor at my last appt lol usually you will need to look for 120's to 170's lol and even at almost 19w the little one is still hard for me to find sometimes
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