All body parts sound the same

I dont know what people are listening to when they say that they hear a heartbeat at around 10 weeks, but Ive had this app since I was 10 weeks, now Im 21 weeks and hear what sounds to me like a train. It has never varied in the amount of time Ive had it, and it sounds the same on my arm. So, dont waste your money, buy a Doppler instead. I think that most of these reviews are from excitable parents who think they hear a heartbeat. Its really just static made into wave links.

CorrineWright about MyBabysBeat - Fetal heartbeat