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Review title: After few years of using it...its useless.
Product review: I've been using it for several years until the rechargeable battery died, so I can't use it anymore without plugging in at the AC socket. I sent an email to Logitech support but they told me that they cannot replace the battery nor repair the unit because they no longer supported it and its already out of warranty. So I vowed that I will never buy another logitech product again.
