Hunting with the Hard of Hearing
 

I'm looking for a buzzer or vibration device of some kind to get my dad's attention in the woods without making too much noise. Turkey season is just around the corner here in MO. I'll be going out with my Dad. He's hard of hearing, but he takes the lead when we're out walking. When I hear a gobble, I'm supposed to get his attention, but it's getting more and more difficult as the years go by to do that. Does anybody know of a small device for sale that can just vibrate in his pocket when I push a button or something?

Walkie talkies with an ear phone.