... 2. USB OUT 5.DC OUT Voltage:12V ~ 19V ( Auto ) / 10V,12V,14V,16V,18V,19V (manual ) ... meantime, and will charge your device internal battery fully in priority, then charge the MP3450L ... capacity/voltage push button that only display battery capacity and can’t adjust the output ... accessories: VI. Product clear picture: 13500mAh external portable battery bank MP3450L Auto Type for digital device / laptop ...