Upgrade Your Connection from Gigabit to 2.5 Gigabit — One Adapter, Every Port Most laptops shipped until recently are still limited to 1GbE. This 2-in-1 USB/USB-C to Ethernet adapter adds a 2.5GbE RJ45 port through a single USB 3.0 or USB-C connection, letting you take full advantage of 2.5G routers, switches, modems and NAS devices that have become mainstream in home and office networks. Why 2-in-1? Desktops usually have USB-A; MacBooks and modern ultrabooks are USB-C only. Instead of buying two adapters, carry one. The die-cast aluminum shell doubles as passive cooling, keeping the RTL8156B controller stable through long NAS transfers and overnight downloads. In the Box: 1 × 2-in-1 USB/USB-C to 2.5GbE Ethernet Adapter, 1 × User Manual Specs: Speed 2.5Gbps (2500/1000/100/10Mbps) · Interface USB 3.0 Type-A (5Gbps) + USB-C · Chipset Realtek RTL8156B · Housing Aluminum alloy · Size 2.87×0.94×0.63 in · Weight 2.2 oz · LED link/activity indicators Note: For full 2500Mbps speed, a 2.5GbE-capable router/switch/NAS and Cat5e or better cable are required. macOS users: please install the free Realtek driver before first use.