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Local wireless access in 5GHz only and main router/AP extention in 2.4GHz

Local wireless access in 2.4GHz only and main router/AP extention in 5GHz

What's the band supported by the main router and wireless clients?
If you main router works in 5GHz band and your wireless clients all support 2.4GHz band, you can choose the second one.

Tony Seaford wrote

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What's the band supported by the main router and wireless clients?
If you main router works in 5GHz band and your wireless clients all support 2.4GHz band, you can choose the second one.

My router is the Motorala Surfboard sbg6782 and it does have dual band 2.4 or 5ghz. All my Wireless Devices list themselves as WIRELESS n except an older wifi radio that is listed as wireless b. I have never tried changing the router to turn on 5.4ghz because I don't understand the benefit or drawbacks. I do see how to turn it on.