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I use the Eartec Valcom 900's
Self contained...no black box
They make the reg earmuff style and two muffs that clip onto a helmet
Great radios
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I mean these valcom are better than nothing, that's true but there are much better options.
These are the headsets we have collecting dust at the shop due to how fragile they are and how static-y they are. You cannot use them near the city or every bank alarm or security system will interfere. Never mind if there is a baby monitor in the house and you have to work on the other side of said house.
They are better than nothing though. Just don't get them wet or have to deal with customer service.
The valcoms are not eartecs.