The doppler works perfectly straight out of the box and couldn't be simpler to use. I was able to find my baby's heartbeat instantly (bought at 20 weeks)and the clarity of sound was impressive - just as good as the dopper units the midwife uses at the hospital. I'm glad I bought it!
This is a fantastic product works really well and very easy to use on your self or with a partner,
Gives you peice of mind to hear your baby's heart beat inbetween your scan appointments. well worth buying