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Dual band routers have two bands: one 5GHz and one 2.4GHz. Tri-band routers have three: two 5GHz and one 2.4GHz. The 5GHz bands can support faster speeds, but don't travel very far or penetrate very well. The 2.4GHz bands are the opposite. They don't support fast speeds, but can cover long distances and penetrate very well. 2.4GHz also has wide compatibility, as many older wireless devices will not have antennas that support the 5GHz frequency. The more devices connected to a frequency band, the more inundated the bandwidth (amount of your internet speed) becomes. If you have a lot of wireless devices, a tri-band router can help by spreading out the load on each frequency, and supply faster wireless speeds across the network. However, if your devices are spread out in a large area, you're likely to get very little out of a tri-band router. In that case, you'd be better off with a mesh system (these also come in tri-band options).
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