Contains a 20,000 mAh Internal Battery: The Powerstation 20K offers up to 4 full phone charges. Charge Multiple Devices: Charge up to three devices thanks to the USB-C and USB-A ports. Powerstation 20K includes USB-C input/output + dual USB-A ports. Versatile USB-C Port: Use the USB-C port to recharge the Powerstation in record time or use that same port to charge a device.​ ​ LED Power Indicator: The mophie essentials Powerstation 20K has an LED power indicator, which lets you know how charged your Powerstation is.