The mophie essentials Powerstation 20K contains a 20,000 mAh internal battery that offers up to 4 full phone charge. The mophie essentials Powerstation 20K has an LED power indicator, which lets you know how charged your Powerstation is. Charge up to three devices simultaneously thanks to the USB-C input/output port and the dual USB-A port. Use the USB-C port to recharge the Powerstation in record time or use that same port to charge a device.