EFFECTIVELY MASKS NOISE: Beloved by generations since 1962, Yogasleep by Marpac is the trusted leader in white noise machines, and created our signature sound the soothing ambient sounds of rushing air. That sound thats helped millions experience better sleep for generations is now available in this light and portable design. The Rohm effectively cancels out noises that may disturb or distract for improved sleep and concentration. 3 SOOTHING SOUNDS: Choose from bright white noise, deep white noise, or gentle surf, then set your volume - anywhere from whisper-quiet to impressively robust. Rohm lets you take control of your sound environment, excellently masking background noise and allowing for better sleep, office privacy, effective soothing for kids and babies, and calming for sound-sensitive dogs. COMPACT & PORTABLE: At just 3.5' in diameter and 3.8 ounces, Rohm fits easily in a carry-on bag or backpack. Hang it on any doorknob or hook to create the perfect sleep environment whe