Heart Sure Technology: The device records and plays Mother's own heartbeat using advanced Heart Sure Technology, providing a comforting and consistent sound environment for your child to sleep. Multiple Sounds: Offers 5 relaxing sounds including Mother’s Own Heartbeat, Ocean, Rain, Summer Night, and White Noise, along with 4 lullabies including Sleepy Lullaby, Brahms Lullaby, Twinkle Twinkle Little Star, and Soothing Music Box Lullaby. Timer Setting: Allows you to set the device to play for 15 minutes, 30 minutes, 60 minutes, or continuously, providing flexibility in creating a sleep routine for your child. Portable Design: Compact and lightweight, making it easy to take with you while traveling, ensuring a familiar sleeping environment for your baby or child wherever you go. Adjustable Volume: Offers 7 volume levels, including a mute option, allowing you to adjust the sound to suit your child's preferences and the surrounding environment. Heartbeat Recording Fingertip Sensor: Includes a fingertip sensor for recording Mother's heartbeat, ensuring ease of use and accurate recording. Hanging Strap: Comes with a hanging strap for easy attachment to a crib, stroller, or any other desired location. Low Battery Indicator: Alerts you when the battery is running low, ensuring uninterrupted use. Power Source: Powered by 3 x AA batteries, providing convenient and portable operation. The Sleep Sound Machine comes with boxed contents including the device, heartbeat fingertip sensor, hanging strap, instruction manual, and 3 x AA batteries. It is designed to provide a comforting and familiar sleep environment for your child, helping them sleep peacefully and soundly.