As you can see from the comparative size of the RCA jacks, the iFi Audio nano iDSD LE is a very small DAC, especially as they have squeezed a 1000 mAh battery inside for portable usage.  Don't let the tiny package fool you, the device supports a wide variety of signals including PCM from 44.1 to 384 kHz/16-32 bit, DSD 2.8, 3.1, 5.6 and 6.2 MHz/1 bit, DXD 352.8, 384 kHz/24 bit.  TechPowerUp reviewed the DAC with both HiFiMAN Edition S headphones and Sennheiser IE-800s in ear headphones, take a look right here.

"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."

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