eSynic Professional 16-300 Ohms Headphone Amplifier 3.5mm Portable Headphone Volume Amplifier Rechargeble Headphone Amp Aluminium Alloy Headphone Jack Amp With Gain Switch for Phones Laptop etc

I like to watch movies on the weekends on my portable dvd player with my headphones, the problem I have is I can't hear the movie clearly with the volume turned all the way up. I suffer from tinnitus so it makes it difficult to hear the movie, but with headphone amplifier it changes everything. Best money I ever spent!!!!!!

It works. This device has a simple task and it functions as described and expected. Glad I got this! I do with the delivery people in Brooklyn would STOP leaving packages outside of my building!

Bought this for my daughter's 2007 JBL with Nav Toyota Solara's Aux input for her iPhone. Her complaint was that she could hear herself "sing" even with the radio turned all the way up LOL. I think a bit of the problem was that I had to install a Ground Loop Noise Isolator to stop the alternator noise when the iPhone was also connect to the car's charging port (this drops the output a bit). This little amp gives more than enough boost to the iPhone's headphone output. I have it set one the switch to L(ow) gain and the knob set to a bit over half. Anymore than that then the audio is over amplified (becomes distorted). I expected the alternator noise to come back because the amp is down stream from the Ground Loop Noise Isolator but it didn't. I have the Ground Loop Noise Isolator stuffed/hidden into the dash and thankful I don't have to move it.One thing that annoys me is the little amp uses USB 2.0 Micro-B (one star off). Why anything new doesn't come with USB-C is beyond me. So I had to buy & use a USB-A to USB-C dongle so the amp can be powered by the open USB-C connection on the cigarette lighter 12v adapter.I have read a few reviews where users complained this didn't work at all for their car's AUX. Not sure how that is even possible, it is clearly works. If you are getting noise from your car, I suggest trying a Ground Loop Noise Isolator too.I've read reviews where this little guy isn't very robust. Hopefully it holds up and none of the little connections break. However, since we are connecting it up into her cubby and won't be disconnecting it, it will last.Edit:I was wrong about the noise when charging, not sure how I messed that up. Real shame but in the end I went a different direction by using a Aux to BT (COMSOON Bluetooth Receiver). Which is a better solution in every way.

works as advertised. Very happy with purchase

I bought this as an attempt to enhance my listening experience in my car. My car is an older model (2003) without Bluetooth and I initially used this adapter: https://www.amazon.com/dp/B01MUXYVOA?ref=ppx_yo2ov_dt_b_fed_asin_title (in addition to a radio interface with a 3.5mm headphone jack plugged into the factory head unit) but did not have much success with the sound quality (volume specifically). I was originally going to install an aftermarket amp but didn't really want to go that route. I do have aftermarket speakers which now I can get these speakers to do what they were intended for! After installing this I no longer need an amp!!! I actually look forward to listening to music in my car even more now!

Louder volume but no increase in sound quality for me. Was using it as a pre-amp from my dash mount Android Auto screen to my head unit's aux input, but it still didn't sound as good compared to using my head units USB input

This particular band works good. I bought a similar one that was poorly built and failed completely apart.

This review is written by the end recipient and posted by the purchaser.A review of the product, Brand: eSynic Headphone Amplifier Portable Amp 3.5mm Gain Switch Audio Rechargeable HiFi Earphone Headphone Amplifier with 1.2m USB Cable and Lithium Battery for MP3 MP4 Phones, Digital Players, and Computers. Model Name: ESYDAC043After buying three units of this model, the last one sent to me was not functional at all. As to the fact of why I had to purchase three, to begin with, the first one I’d bought lasted roughly two and a half years; it worked well up until the female jack for the headphone came off the unit’s circuit board. So, I ordered another one. After only a few months, the same thing happened. (Take note: I keep the product in a cushioned pouch, and I did drop the pouch.) I decided to take it apart and discovered that just a hair of solder had been used to hold the female jack in place on the board. Even so, I did like this product and had a friend order another one for me. When it arrived, this one didn’t work at all. I could only guess the jack must have come loose during shipping. And it’s not an easy task for me to do returns, so I opened that unit up too. And again, I saw the problem, virtually no solder had been used on the female jack. Apparently, what was on the circuit board wasn’t enough to keep it in place to the board itself. (It probably did come off during shipping.) And as far as flux goes, there’s really no way for me to judge how much flux was used...but all-n-all, I believe the solder job was incorrectly done. And I’ll say again; it’s difficult for me to do returns because I am at a Civil Commitment Center. I understand that most electric components must be returned in the original packaging, and the mail room usually destroys it. I couldn’t afford to take a chance in buying another one, the money was adding up, so I went ahead and ordered a different amplifier from another company, and it’s working great.