After doing a little research, I can now tell you (basically) everything you ever wanted to know about black boxes...
Your best bet, be it for general use in academic studies, health and safety concerns or simply security, would be to employ a digital two-way radio system, something like the Motorola SL4000. I'm specifically suggesting Motorola because they handle jobs like this all the time, several of which are detailed on their website.
The old adage that 'mobile phone emissions can cause cancer' is a commonly held belief that doesn't actually have a huge amount of evidence behind it. Nevertheless, a lot of people genuinely believe that they can/will develop cancer after extensive use of a mobile phone.
I had a therapist, one to whom meant the world to me. The woman who I called to tell my deepest fears, the most intimate details of my double life, was let in to my world hesitantly. Smoothly, she entered my life. Cunningly, she slipped out of it.
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