Lavaudio ds100 hi-fi audio dac basically a tiny little portable headphone amp powered by the cs43198 dac chip but it gets better because it has usb-c on one end and a 3.5 millimeter headphone jack on the other and it comes with two little tiny adapters one of which is lightning which is all your ios devices like an iphone or ipad to usb-c and then the other one is just simply usb-c to usb-c. You can plug and play with IOS, with android you have to enable something called OTG and that just means that there's more power and more capabilities coming through the usb it's part of the debugging system for android i'm not sure why it's not on by default but you can find a million different places to get the instructions on how to enable OTG and then it's plug and play with your android device.

DS100 USB DAC Headphone Amplifier has enough power and enough output to drive headphones up to 120Ω

A strong contender praised for its size, soundstage, and great sound across bass, mid and treble. Hear the best version of your music. Compatible for easy plug-and-play onto your devices with USB and Micro USB versions. (driver download required for Windows) Ultra-portable and slim, take it anywhere and everywhere with you. Connect to your smartphone/tablet and boost your music to the next level. Listen to your music in HI-RES Audio with great PCM audio files support up to 32 bits / 384 kHz and DSD up to Quad-rate 11.2 MHz. Never miss a beat.