... size,portable 2.With USB 2.0 port for all mobile charging 3.12 months warranty 4. ... 1.small size,portable2.With USB 2.0 port for all mobile charging 3.12 months warranty4.CE, ... efficiency: ≥95%, good charging performance.6).Overall quality test before factory such as loading output,no-loading output, ... , Hi-pot, Resistance, burn-in/aging, temperature shock,drop test,vibration test etc.Product pictures: