Just mount this RTC Shield on the GPIO port of the ODROID-C2 to keep the time when your ODROID is offline. A Lithium-coin battery can keep the RTC chip running up to 3~4 years without external power supply.
You can still use ODROID official case using this shield.
The HiFi Shield Plus provides both stereo RCA connectors to connect to external amplifiers and other audio equipment. Via TI’s high-end PCM5242 DAC chip(known as Burr-Brown), it supports 16, 24, 32 bit audio formats with minimal THD+N ratio (0.002%) and ideal dynamics (114dB+), plus amazing sampling rates of 384kHz