Press the switch once. Power bank begin to work. Press the switch twice consecutive 、the led is light.When power bank get charging、4pc Indicator lights will keep flashing. Specification:1.Output Voltage: DC 5V2.2port Output Current:1A/2A max3.Input Voltage/Current:5.0V / 1A4.Battery Capacity: 3.7V/50000mAh5.Solar PV Panel: 5.5V 300mA 1.5W6.Solar conversing rate: 7~10%7.Product dimension :(L)132*(W)76*(H)21mm8.Dimension:(L)150*(W)100*(H)30mm9.Net weight :290 g10.It can charge by sunshine or computer or AC power.Material: New Ultra-thin aluminum alloy shell design. - Scope: All phones are applicable! Package :1 x 50000mAh Solar Power Bank1 x 8 adapter1 x Retail Box