Review on 🎧 Fosi Audio N2 Headphone Amplifier: Portable Amp with 3.5MM Gain & Bass Switch for HiFi Earphones - Powered Dual-Output, Compatible with iPhone, iPod, iPad, MP3, and Computers by Joe Merculief

This is a great compact amp that's easy to carry. It's light enough and small enough to fit in a pocket, but personally I wouldn't feel comfortable using it for long sessions, especially jogging. I use open-back headphones to listen to my electric guitar while practicing. I have a Fender Mustang Micro Mini headphone amp connected to my guitar and am routing the output of that amp to his Fosi Audio N2 for added amplification. Fosi allows me to keep my Mustang Micro's volume very low to save battery life and reduce distortion. Charging a device is easy, and I'm grateful that more and more device manufacturers are moving to USB-C as the power standard. I've only used this amp for a few hours so far, but it holds a charge well without needing to be recharged. The volume control is firm and has a comfortable feel. The gain and bass switches are very small but feel solid enough for their purpose. I'm not sure how hard the switches can go, so definitely do not let toddlers play with this amp unsupervised. The volume is big enough for my purposes and I really appreciate having a gain switch. I've experimented a bit with the bass switch, but I don't use it much for guitar playing. It definitely adds a bit more "oooooooooo" to the pop bass lines.