If you are an audio enthusiast, you need to learn about these. Read the reviews online and decide for yourself. This model has the extra cables to attach to either iPhone or Android. It will improve your sound experience without question. I’m selling only because I’ve moved into the exquisite joy of enjoying meditation and silence. It’s in immaculate condition and works awesomely. Sells for $50, you can have her for $25. https://www.tempotec.net/en-ca/products/headphone-amplifier-tempotec-sonata-hd-pro-hifi-decoding-for-android-pc-usb-type-c-to-3-5mm-adapter-dac-portable-audio-out https://www.head-fi.org/showcase/tempotec-sonata-hd-pro.24181/