Dual band routers use 2 frequencies to establish a network, a 2.4GHz frequency and a 5GHz frequency. The 2.4GHz WiFi band become increasingly busy, since there are more and more devices that use wireless internet. That's why dual band routers use an extra 5GHz band, which is larger and calmer. Your router automatically connects your compatible smartphone, computer, or game console with the faster 5GHz band. This means you can enjoy a stable WiFi range at high speeds.