This is a 4.4mm jack compatible dongle DAC. When you plug this into your computer or smartphone, you can use wired earphones/headphones with a 4.4mm jack. Please note that this is not the standard 3.5mm size. I opened this new this month and checked its operation with a Pixel 8 and a PC. I confirmed that sound comes out of the earphones. It's in almost new, beautiful condition. Please remember that the lamp won't light up and it won't start up unless you firmly insert the jack all the way in. There are some minor scratches on the box from when it arrived at my house, so please purchase with the understanding that it is a used item. I will package it in plastic for rain protection and ship it. Thank you very much. m(_ _)m #DAC #DongleDAC #Nexus