I have worn a terminator 2 on my ankle and a el silverado on my arm with the beck silver pulser on my wrist....
I noticed no ill effects other than a mild herx(some pimples) the next day from all those electrical devices cleaning house,....also when wearing more than one zapper be sure to drink a little more water than usual as you are speeding up the body's elimination process x 2 and could get dehydrated easily ive noticed...
you'll have the benefit of zapping with two different frequencies...