Product Name: Sleep Sound Machine, White Noise Sound Machine for Sleeping Model NO.: Sleep Sound Machine Group: Adult, Chinld, Baby LCD Display: Without LCD Display Certification: CE, ISO13485 Theory: Electrotherapeutics Function: Sleep Health Care Instrument Type: Health Care Trademark: aeon or OEM Origin: China Product Description FEATURES:<MOTHER'S HEARTBEAT>Use a professional medical sensor to capture the mother's true heart rate for playing the closest sound to the mother's real heartbeat.<6 DIFFERENT SOOTHING SOUNDS>Choose 4 Classic white noises to simulate natural environment white noise: ocean, stream, summer night and light rain. Besides, There are one lullaby and mother's heartbeat store in the machine.<PROFESSINAL SOUND CAVITY>The professional sound cavity design make perfect sound.<ADJUSTABLE VOLUME>The adjustable volume key allows you to select the proper volume to cover background noise and ensure a good sleep for your baby.<PROTABLE>The compact design, small size and light weight make it easy to put into your handbag or suitcase for travel.<Auto-off Timer>You can choose to play the relaxed sound continuously, or you canturn off the sound with timing 15, 30 or 60 minutes.<SOOTHING BACKGROUND LIGHT>The design of the button background LED light is convenient to use at night.SPECIFICATIONS:Power supply:3*AA 1.5v alkaline battery or 5V 1A@110-230v50/60hz power adapterSize: 123mm*125mm Weight: 245gPowerofthespeaker:3WHeart Rate Test Range: 30-250BPMAccuracy: 1BPMInterface:USBportforHeartRateSensor