1.Optional color: blue, purple, black, silver,red 2.Have a power indicator&LED lamp 3.long cycle life,low ... . Optional color: blue, purple, black, silver,red Main application fielduniversal usage as stand-by power for cell phone, smart phone, iphone ... : no less than 200 pieces per item. 2200mah power bank external battery pack/for iphone 2200mah portable battery power pack/battery pack for iphone