Hear and share the precious sounds of your unborn baby's tiny heart without the use of ultrasound technology or any invasive system. This heartbeat sensor allows you to start listening to your baby's heartbeat, hiccups and kicks beginning around the middle of the second trimester (typically between 21-28 weeks). The recording cable records the heartbeat directly to your home computer to share with family and friends via e-mail! Included instructional CD guides you through the process of using the listening system. Also includes two headsets so two people can listen in at the same time. Requires one 9-volt battery (not included).