j5creates JCE145 is a simple external adapter that plugs into the USB-C port on your laptop or MacBook. The JCE145 is an optimal solution if you do not have an Ethernet port or if you just want to increase your network speed. The elegantly designed JCE145 uses an RJ-45 connector that supports 10M/100M/1G/2.5 Gbps Ethernet performance.