iFi Audio nano iDSD LE @ techPowerUp
 

iFi Audio's nano iDSD LE is a little DAC/amp with big ambitions. It packs all the knowledge from the bigger DAC/amps in iFi's huge portofolio of products into a small package. Despite being small, it still features RCA line-outs, a very respectable headphone amplification circuit, and a 1000 mAh battery.

https://www.techpowerup.com/reviews/.../Nano_iDSD_LE/