Neoteck3.5mm Headphone Amp with Bass Boost Portable HiFi Headphone Amplifier, 16-150 Ohm, Aluminum Matte Surface for Mac, Phones, iPad, MP3, MP4 Computers PS4 PS5 Controller

Quality product right here.I dont normally leave reviews but I like this device so much I felt like I owed them to. Solidly built. Works great. Feels great and the bass boost is a nice bonus.

high output, solid audio and build quality, brought life to my car speakers; be careful not to blow your speakers because this packs a punch

Not a bad little device. Works well with my AKG 371 headphones.

This is just right. No longer do I have to put my volume in the car all the way up for every piece of music and I can hear the low points in the classical selections. Very happy with this unit.

Essential for fingertip boosting low volume videos, and controlling volume when listening to videos that are too loud. Essential on airlines when engine noise drowns out low volume movies even if you have noise cancelling, over-the-ear headphones. I can't listen to my computer without one of these things. Has its own rechargeable battery. Would highly recommend this unit. Tried a less expensive one, and it burned out. I have two of these. One for desktop and one for travel.

Did not meet the standard.....but I'll keep it anyway

This works very well, I have a hearing problem and plugged it into my TV and into my headphones , works great.

A quick review because I received a obviously used, and charged item--back it goes.For what it is, it works well enough for cheaper headphones with higher spl (efficiency).Time to charge--I don't know, it was almost fully charged when I received it---the charge light turns from red to green.I paired it with a a Sony MDR-ZX110 driven by the line out of an Surfans F-20 MP3 player.This, compared to other $20.00 ish high efficiency headphones seems to be the sweat spot. Other headphones which work better with out an external amp (like the Jlab Neons) seem to fall apart with this amp.The bass boost function is not too muddy and perhaps useful if you like that sort of thing.Anyhow, it doesn't have the gain function I need to drive more demanding cans like AKG's and so forth----therefore I am returning it.