Main Feature: Product Features 1. Use 1800mAh batteries to power it and the output is 5V/1000mA max 2. Talking time of iPhone can last about 60-180min after charging. The stand-by time is over 48hour. 3. Solar panels and mini USB input 2 in 1 Specifications USB Input: 5V 500mA solar panels：5V≥200mA Charging current: 3.6V: 500 ±50 mA Charging voltage：3.6VDC Operating Temperature: 0℃-40℃/20%-90% RH (Non Condensing) Storage Temperature: -20℃-60℃/10%-95% RH (Non Condensing)