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If you have a beard, or goatee or something, it's nice to have the one blade at the top for precision. Besides that it's just a gimmick. As far as the battery goes I took the battery out and never noticed a difference on my mach 3.
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"..and which one of you had the prime rib?" - Waiter
"frankly, I don't see how that's any of your business!" - Peter Griffin
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