Multi-functional with those different adapters, compatible with cell phones, Mp3/ Mp4 players, flashlights and other electronic products. Your daily life or traveling will not be limited by the short of power supply. Ii is light in weight, elegant, mini size and portable. You can do your work free influenced when charging. Easy to use, no installation tools are required. Two AAA batteries are needed. Working voltage: DC 0.8-3.5V. Maximum output current: 850mA-1A. Rating output current: 600mA Power conversion efficiency: ≤85%.