... Li-Polymer battery .4) 20000mAh capability, powerful with long operation time.5) be compatible with Nokia, iPhone, iPad, MP3, MP4, and other mobile ... ) High efficiency of power conversion.8) Electricity-saving function.9) With 4 LED power indicator.10) Partable, practical and long cycle ... cooperation! )Photo reference : External Battery Charger 20000mAh USB Power Bank for iPhone/ipad mini