Fetal Doppler!

THE Brittany 🦄 • Railroad Wife 🚂 Mommy to Ava Grace (11/28/15) Colton David (3/15/19) #3 (our angel 👼🏻) and #4 Layla Rose (10/28/21)
I really want one and am looking to buy, so I'm just wondering which model do you recommend, If any?