The EnGenius SN-920 cordless phone system. Billed as having the longest range of any cordless home phone. Apparently 9 times the power of ordinary units gives a range of up to 5 miles, and the handsets can also double as independent walkie talkie units. I’d be a bit worried holding a handset with that much power near my brain for extended periods, though. Know what I mean? Around $373.00.
This power produces the EnGenius long-range performance that outdistances all other cordless phones. In office buildings you can expect up to 12 floors of penetration, in warehouses up to 250,000 square feet can be covered, and on a farm or ranch cover up to 3,000 acres.