i didn't know about the wrist watch type, but i have seen the shaking bed alarm clock, does it have to be strapped to your wrist? because, you know, reasons....
Hotels are required by ADA to have bed-shakers that hook up to the phone. The person places the shaker under the bed, and when the phone rings (like for a wake up call), the thing goes off and feels like a really strong vibrate on a cell phone.
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