Yogasleep Rohm Portable White Noise Machine
A puck about 3.5 inches across with a rechargeable battery, three sounds and a volume dial that moves in small steps. The choices are bright white noise, deep white noise and gentle surf, all digital, and the machine charges over USB, so a phone brick or a laptop port is enough. Usual price sits near thirty dollars, which is why it turns up in hotel bags and hospital kits.
Sensible for travel, night shifts and a nursery where the cord would be in the way. Not the right tool for a large bedroom: the single small speaker gets thin at high volume and will not cover a snoring partner the way a mains machine does. Charging is slow, and there is no display to show how much battery is left, only a small indicator light.
Pros
- Fits in a coat pocket, about 3.5 inches
- USB rechargeable, no batteries to buy
- Three sounds including gentle surf
- Smooth volume control at low levels
- Often around thirty dollars
Cons
- Small speaker sounds thin when loud
- Only a light shows battery status
- Digital tracks, audible loop for some ears
- Not enough output for a big room
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