Headphone Amplifier HIGI Impedance Headphone Amp Support 3.5mm AUX Input which can be Used with Either MAC, Mobile Phone, PS4, PS5, Laptop or Desktop System (600Ω Headphone Amplifier)

It Works, plain and simple!At least 10 hours of battery time.Good and loud with Gain both off, or on.Bass is over the top, but not needed!Cons: 1. its heavy, but that's what makes it strong for keeping in your laptop case and traveling. 2. My laptop wouldn't charge it... not sure why, but I add have to add it here. Though any other UBS charge works fairly quick. Using a Sager Notebook.After Thought: Why didn't I try anything like this years ago. Could have easily saved by paying once, and not having to pay again every so many years.

Works perfectly to enhance the volume from my portable dvd player that has fad weak volume.It was packaged well and increases the volume clearly and dramaticallyGreat product. It is made of metal and is soldThanks for a great product.

This is good sound but the 3.5 auxiliary brakes after one week used it’s weak and not supported enough

The first one i received did not work well , caused some feedback to tje headphones but after I got the second one it worked fine , nice sound no problems...the first one apparently had some bad outputs that didn't have a good fit

This gave me a new musical experience but it makes the sound quality a little degraded. Overall, great device.