Summer Infant Heart-to-Heart Digital Prenatal Listening System Hear the precious sounds of your unborn baby's heartbeat, kicks and hiccups with the Summer Infant Heart-to-Heart Digital Prenatal Listening System. Digital technology provides clear sounds, while two sets of headphones let mom and loved ones share special moments listening together and bonding with baby. Product Highlights 100% digital technology for clear sounds Two sets of headphones allow multiple listeners to share the experience Designed to be safe and non-invasive Adjustable positioning belt helps mom stay comfortable Volume control helps provide a great experience Recommended for third-trimester listening Requires a 9V battery (not included) Product dimensions: 3.75"L x 0.75"W x 6.5"H Share the experience Two sets of headphones and 100% digital technology provide clear sounds of the unborn child's heartbeat, kicks and hiccups to mom and dad or other loved ones. Secure and safe The adjustable belt helps keep mom comfortable, and the non-invasive design is safe for the baby. Product Description Hear the precious sounds of your unborn baby's heartbeat, kicks, and hiccups with the Heart-to-Heart Digital Prenatal Listening System. Digital technology provides clearer sounds, while two sets of headphones let mom and loved ones share special moments listening together and bonding with baby. Features: 100% digital technology for clearer sounds Adjustable, positioning belt for comfort Volume control Safe and non-invasive Recommended for third trimester listening Summer Infant, an award winning industry leader in developing infant and toddler products offers families safe and innovative solutions that provide peace of mind.