Are these good to use for a high school football team?

I believe it should be. We use it for church and it can be pretty load and we are able to communicate with each other well. It is a great device I only wish they had single ones to add to the others we have.

does this works through radio frequency?

Sorry for the delayed response. We use these at a public TV station in a mesh of RF frequencies that cover a very wide range, as well as various IP wireless networks. We have not encountered any RFi issues thus far. We've used them quite often for about a year.

Control Method	Remote
Controller Type	wireless
Control Type	remote
Unit Count	5 Count
Item Weight	113.4 Grams
Headphone Folding Features	Over Ear
Earpiece Shape	Over-ear cup
Headphones Ear Placement	Over Ear
Theme	Professional Communication
Color	Grey
Battery Average Life	6 Hours
Wireless Technology	DECT
Connectivity Technology	Wireless
Carrying Case Material	Nylon or Polyester
Is Electric	Yes
Cable Features	Without Cable
Additional Features	Microphone Included
Specific Uses For Product	Two way communication
Frequency Range	1.9 GHz
Audio Driver Type	Dynamic Driver
Frequency Response	1.9 GHz
Noise Control	None

Eartec UL5S Ultralite-HD 5-Person Full Duplex Wireless Intercom Headset Communication System, Single Ear Headsets, Up to 1000ft Range, U.S. Company

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