After reading other reviews we weren't convinced that it would be any good, but from 10 weeks we could hear a heartbeat and from 12 weeks we could hear movements.
The further along we have gone the more often and louder noises we could hear.
I can't stress enough what some other reviewers have said,
DON'T WORRY IF YOU DON'T HEAR ANYTHING EVERY TIME AS WHEN THE BABY MOVES INTO A NEW POSITION YOU MAY NOT BE ABLE TO HEAR, THIS IS NORMAL.
It sometimes takes your midwife, using professional equipment, some time to find the heartbeat.
Overall a great product at a great price.