1.One for four More general.Compatible with Micro/Lightning/Type-c.Three interfaces + comes with USB power cord. 2.Comes with USB power cord Go out without wires.Rechargeable polymer batteries.Go out with a full charge anytime, anywhere. 3.Charge four at the same time share the happiness.2.1A current, four sets charge at the same time, bid farewell to wait. 4.Accurate LED digital display Battery level at a glance.The battery is accurate to each percentage See how much is left at a glance.