What is White Noise?
White noise is sound that contains all audible frequencies (0–20kHz) at equal power. Unlike irregular, jarring sounds (traffic, alarms),
white noise is uniform and continuous.
Simple understanding:
Regular noise is irregular, sudden and harsh, such as car horns and construction. It can easily wake people up during sleep.
White noise is uniform, continuous and soothing. such as rain, ocean waves and fan hum.It masks distractions and helps people fall asleep quickly.
How It Works: The Masking Effect
White noise creates an acoustic "blanket" that covers up sudden environmental sounds. Your brain processes a constant stream
of audio,leaving no bandwidth for disruptive noises to register.
The result? You fall asleep faster and stay asleep longer.
The Problem with Current Solutions
• Phone apps → Notifications interrupt, screen emits blue light
• Fans/AC units → Seasonal limitation, inconsistent volume
• Basic sound machines → Limited sounds, poor audio quality
You need: Professional, portable, customizableSleep Sound Machine
Meet the A820 Sleep Sound Machine
Features
• A Heart Rate Captured Area, use finger to record real Heart Rate. Playing the mother's heartbeat sound can soothe the baby's mood and
promote sleep.
• Bluetooth Function, to play sounds on your phone.
• Recording Function, easily record any sound for playback.
• 20 Different Soothing Sounds: heart rate, natural sounds, lullabies and white noise.
• Wired Headphone Output (Line out): for personalized sleep soundscapes.
• Suitable for All Ages: adult, children and infants.
• 4 Timer Settings: infinite, 15, 30, 60.
• Auto-Dim Lights & Volume Fade — light and volume gradually dim together for natural sleep transition.
• Support Type-C Charging — modern, convenient charging.
• 10 Colors of Night Light — customizable ambient lighting.
• 7 Volume Levels — precise volume control for any environment.
A820 = Heart Rate Recorder + Bluetooth Speaker + Voice Recorder + Sleep Sound Machine + Night Light
One device. Better sleep for the whole family.