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-speed requirements ?
-power consumption requirements ?
-data or voice (i guess data because of -51)
-price target ?
And of course it must be legal.
Frequency bands are country dependant.
Perhaps some of the ISM-bands will do ?
Many manufacturers exists.
Serial interface is convenient to use and there are
ready made solutions (though expensive).
Special attention must be payed to protocol.
-speed requirements ? 9600bps or any RS232 standard
-security ? no need (secured by sotware)
-power consumption requirements ? doesn't matter
-data or voice (i guess data because of -51) ? data
-price target ? doesn't matter