Yu9 U-554
The Yu9 U-554 is a well-made clone of the Etymotic Research ER4B. It has an improved fit, improved usability, and definitely better value for money than the original. The packaging is not cheap either.
The Yu9 U-554 is a well-made clone of the Etymotic Research ER4B. It has an improved fit, improved usability, and definitely better value for money than the original. The packaging is not cheap either.