Fetal Doppler

LC
I am 12w3d and just recently purchased the sonoline b pocket fetal Doppler. I was nervous to purchase it at first but it brings me so much reassurance and joy! I love it!!! The manual that came with it says it's designed for daily use. 
I have been concerned though about safety. Does anyone know if use of this type of Doppler could cause harm to my baby?  
Here is a pic of the manual print.