The Heart-to-Heart Prenatal Listening System from Summer Infant is a wonderful way to hear and share the precious sounds of your unborn baby's tiny heart. It is the perfect way to start the bonding process with your baby. Monitor unit allows you to hear your unborn baby's heartbeat, kicks and hiccups A wonderful way to bond with baby Includes two sets of headphones for Mom and loved ones Includes cables to record precious sounds that can also be emailed Volume control Convenient adjustable waist strap included On/off button Instructional CD included Safe and non-invasive