Chillaxman
New Head-Fier
I'm not sure if your concern was you can't plug the Dragonfly Black into your phone or that it draws power from your phone but to clarify the Dragonfly Black does work with all Android's that support OTG and will draw power from your phone.
Another option is the First E17K you mentioned. However the DAC section isn't actually fully supported by all Android phones and it is a discontinued product.
Yup my concern was if i can't plug the Dragonfly Black into my phone to draw power. I guess i have to buy an OTG to be able to use it. If you compare the two, would the Dragonfly Black be a better choice? Also, i see that theres no buttons or anything on the Dragonfly Black, does it just auto optimize the sound or is there some way for me to change and tweak the sound?