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    I wonder for how long that continued. It seems to me that the sidekick and its successors died off in 2009 or so.

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      Stopped selling in 2010 and stopped the services in 2011. see: https://en.wikipedia.org/wiki/Danger_Hiptop They were great devices, and one of the first to make it pretty easy for deaf/HoH folk to communicate, that’s why I used it.