... business gift and valuable Solar charger for smartphone mobile phone, backup battery Specifications:Main Function: Solar battery charger for portable electronics with ... Output Voltage: 3.7v, 4.2v, 5.5v, 9v - Output Current: 400-800mAh Solar Panel: Monocrystalline silicon panel LED Indicators- Battery ... / Output / Buttons- Voltage switch: 3.7v, 4.2v, 5.5v, 9v - Power IN / OUT / LED switch - 3 White LED ...