Just purchased and installed in my Shoei RJ Platinum helmet. They fit perfectly into the cut-outs in the helmet. I didn't even use glue and they are safe. Connected my iPhone and WOW. Great little speakers. I rode my bike (Honda Goldwing) first on the surface roads with various speed limits (up to 45 mph) and then on the freeway where I hit 80 mph to test the sound. They were more than loud enough until around 75-80 when wind noise tended to drown out much of the quieter music. On shallow roads I had to turn the volume down about half or it was too loud. They're good in that you can also hear ambient noise around you, which is a safer situation. I can only recommend these helmet speakers. Time will tell how they hold up and I'll update if there are new issues.
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