The UPS2 for U3 is designed specifically for the ODROID-U3. Uninterrupted Power Supply is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. The on-battery runtime of most uninterruptible power sources is relatively short but sufficient to start a standby power source or properly shut down the ODROID-U3 It is equipped with a rechargeable 3,000mAh Lithium Polymer battery and a charger with a booster IC for 5V output.
When the AC power source fails, the UPS2 keeps supplying the power to the ODROID-U3 with the battery. There is a digital output pin to notice the battery low-level warning to the ODROID-U3 to trigger the shutdown process. And the AC power source available, UPS2 will supply the power to the ODROID-U3 again automatically.
It will significantly reduce the risk of data loss by sudden power-down.