Girls good evening) I recently wrote that I wanted to buy a doppler an…

Girls good evening) I recently wrote that I wanted to buy a doppler and a month ago I bought it. Now I have a question and it slightly worries me about the sound of the baby's heartbeat. I will leave two videos, listen. Is it normal for the heart to beat quickly at all, or how is it on ultrasound? And I have a constant such sound, slowly beats but on the screen shows 140-150-160. Or maybe I bought a defective doppler, can you help in general)