Mr Handsfree K3 4000 mAh is a portable charger that can charge two devices simultaneously. It has a capacity of 4000mAh, which is enough to charge most smartphones multiple times. The charger comes with a micro USB cable, which can be used to charge the charger itself or to charge devices that use a micro USB port. The charger also has two USB ports, which can be used to charge devices that use a USB-A port. The charger has four LED indicators that show the remaining battery capacity. When the charger is charging a device, the LED indicators will blink.