If you don't use Bluetooth, you have to use an adapter cable to listen to songs on your cell phone. Bluetooth often needs to be recharged and wireless transmission will lose the sound quality.
If you want to have better sound quality in a compact package, try Audirect latest product - Atom Mini, which is equipped with ES928 DAC Pro decoder chip, providing you with 32bit 768kHz / DSD512 decoding capability and weighing only 8g, it is extremely lightweight.
Audirect Atom Mini Product Features.
What's in the box ?