I'll second that, easy to use. I've got the 5, but even that works great up to around 100 meters. Music, phone, bike-bike, rider-pillion with crystal clear noise reduction and runs all day (long 8hr+) on a single charge. Uses the same charger as most phones (USB) and you can charge while using it if you need to.

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Never underestimate the power of stupid people in large groups.