Neoteck HiFi Headphone Amp, Rechargeable Portable Headphone Amplifier with Gain Switch, 3.5mm Input/Output, Aluminum Shell, 16-300Ω Headphone Amplifier for MP3 MP4 Phones Digital Players and Computers

I originally purchased the eSync version but it arrived with a faultThis Neoteck was the next on my list so got this instead. It was just a few pounds more than the eSynic oneI needed it for my Yamaha NP12 piano as the sound through headphones is just too quietI charged this up within 1.5 hours, the red charge light turns green once fully charged, and immediately tried it outIt’s made a world of difference to my piano. I set the volume on the piano to about 3/4 and had the Neoteck on the ‘low gain’ setting and volume about 1/3 and it’s now nice and loud. If I turn it up further it hurts my ears it’s that powerfulFor the bargain price this is a great little amp and I’d totally recommend it

I wasn't really sure I wanted or needed a headphone amp and bought this on impulse after watching a review. It is a great little device that has lots of uses. Even when you already have a headphone output (like on a laptop) placing this in-line gives you easier control of the volume and improves the sound. Also useful for adding headphones where you only have a line output. It sounds good and battery life has been fine considering the low cost.

Useful little amp. I’m using it to amplify some pillow speakers. OK unless I have the volume up high, as it gets a little distorted at full volume. I really would have like the charge light to be on the front.

Boost the volume from my old laptop through to good quality ear phones great.

I bought an old run around as a second car with no Bluetooth etc. The auxiliary volume level was ridiculous! I use this when I want to get the party started and it even makes it sound better and the battery is long lasting- Brilliant!

As far as I know my dad seems to be happy enough with this wee product! Seems to be reasonably priced too. Again you only get what you pay for!👍

Very disappointed with this product. If I put the headphone jack fully into the amplifier it only outputs mono sound, not stereo sound. Tested with multiple devices and different headphones.If I wiggle the headphone jack so that it is not fully inserted into the amplifier it will play stereo sound, but any movement will jostle the headphone jack and it is back to producing mono sound. Device is fully charged.

Item was describe as having an out put of 4.4 watts. This is nowhere near that. It probably has a mor realistic out put as. 0.5 Watts. The construction is superb but it is let down by the low output. I think they need to address the misguiding ad.