Monitor your baby's heartbeat with the Sonoline B Fetal Doppler. Easy to use and featuring a built-in speaker, this device offers peace of mind for expectant mothers. This is a used Doppler that needs a new probe. They are $19.99 on the company’s website. The device works and will pick up static sounds when moving, but will not pick up a heart beat without a new probe (I tested it with another unit using a 3mhz probe and it did great!). Will ship without batteries. From a smoke free, fragrance free, pet friendly home.