Note this is Normal Bias for 6-pin Normal Bias stax. It will also work with 5 Pin pro bias stax, but will drive them at a lower volume.

This is a transformer box to be used with your existing speaker amplifier to drive Stax normal bias headphones.

The quality of these is supposed to be much higher than even Stax dedicated amplifiers because you can use it with your existing quality speaker amplifier, with a switch to switch between the speakers and the Stax headphones.

It is 100-240V so can be used worldwide. It has a 2 prong plug on it, which you can easily buy an adapter for your country plug for a few pounds