it seems to have a built in overspeed sensor, when I hit 115 there is a loud whistling sound which come on quite quick, not a gradual build up.
but keep it under that and the helmet is fantastic

Mistakes:
Learn from the mistakes of others. You won't live long enough to make all of them yourself.
Mistakes:
Learn from the mistakes of others. You won't live long enough to make all of them yourself.
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