Review on 🎧 Portable Headphone Amplifier with Bass Boost - Mini Headphone Booster with Volume Control, Rechargeable Battery, Durable Metal Casing, USB/Stereo Cables - Compatible with iPod, MP3 Players, Laptops, and Mobile Phones - Pyle PHE5AB by Gregory Shin

If you (like me) are thinking of buying this item because it is compact, cheap and advertised it will do what I need it to, DON'T DON'T let me deceive me This item will not function unless connected to a power source. First thing I thought of. Well, it can happen after mass production. i have a bad one Sent back, same problem on the second one. Called Pyle and all they could tell me was they're so sorry this happened. I felt more sorry for them because they couldn't give me any feedback on their product. If you're still willing to take the risk, I hope you have better luck than me.