... battery lifetime.Features:* With two USB output port,it can charge two devices at the same time .* ... .* Press the centre button to charge and press it again stop charging.* Partable, practical and long cycle life ... bank. if charge by USB connect computer, it takes longer for full chargeCompatible:*Part 1:ipad, ... models of cell phone with above brand ,but it's not all models,please check our picture ...