... h 3.B/R/Y/W,accept individual logo OEM Portable back-up power performance:1.Features: mini design, ... charging the built-in battery, connect it to the mobile phone. While pressing the switch button for 3 seconds, ... for 3 seconds. It is also the time for mobile phone charge. While charging the phones, just press the ... light represents 20% battery power. Mini Type USB charger,portable mobile phone charger