Get a pair of FRS radios with a call button. Push that and it makes a noise on 
all other FRS radios in range on the same channel. For your use you'd want an 
older pair with shorter range.

      From: Gene Heskett <ghesk...@shentel.net>
 To: emc-users@lists.sourceforge.net 
 Sent: Monday, February 20, 2017 7:39 AM
 Subject: Re: [Emc-users] [OT] Wife is good to go
   
I'm thinking in terms of a well built gismo we can hang on good 
necklasses, 2 buttons, one makes the other unit scream for attention, 
the other acts as a walkie-talkie PTS. I don't even know if such a 
critter is available, but I don't want to be slaved to some monthly 
service like they tout endlessly on the telly. Something about the size 
of the fob for your car keys with its grouping of buttons.  Those things 
are tough and can only be destructed by time & button battery failures.  
Working range maybe 100ft thru the alu siding of the house so it can 
catch me even if I'm on the rider trying to control my jungle.

Cheers, Gene Heskett

   
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