The USB REGEN takes the digital audio stream from your computer or other music streaming device, and generates a completely new USB data signal to feed to your DAC.  It accomplishes this by combining a carefully chosen USB hub chip with an ultra low-noise regulator and low-jitter clock.  Importantly, it does so with ideal impedance matching—right at the input of your DAC.

Source: Uptone Audio

Summary
Despite so many defenders of this class of products, measurements and objective analysis of the devices lends to no useable benefits. High performance DACs are designed to sound and measure excellently without such tweaks (after all, if there was something to these devices, they would include them in the DACs themselves at the prices they are charging us).

My opinion of hearing improvements from users is simple: when you test things you tend to focus more and with that, you hear details that were always there but you did not note them. Such difference can be quite convincing but unfortunately is not real. The soundwaves out of the box do not need to change to hear such differences.

My suggestion would be to save your money and put it toward purchasing music.

Uptone ISO Regen Review and Measurements - Amirm