A total of 1 review of this product on Reddit.
28th May 2010
I vaguely recall my ex-stepmother parents having one. They were both deaf, so a standard alarm clock did them no good. You could try looking around at online stores that cater to the deaf community.
Another alternative is to just spend $6 or so and buy a mechanical timer switch that plugs directly into the wall, and set your on and off times via the interface.
EDIT: I did find this.