These are supposed to be appearing sometime in March, no prices seen yet.
Potentially very handy replacement for the FRS units, should work better inside steel frame buildings at 900 MHz.
'Secure' is only 'can they guess your channel', but when you're using the top end unit, 'can they guess which of 10 billion channels you're using' is fair security, I guess.
Further info on these, from the FCC certifications:
Frequency range: 906.275 - 923.750
Power Output Max: .945 watts
There is no such thing with these units as CTCSS or the like, simply 'channels'.
The TSX-100 has channels 0-999, The TSX-200 has channels 0-9999, and the TSX-300 has channels 0-9999999999 plus NOAA weather recieve.
Set a unit to channel 12345, and it communicates with any other unit set to channel 12345. IF the price is good, these might just do the job for quiet, semi-private communications for a LOT of users.
I notice there are some concerns about RF exposure at these frequencies, the manual offers cautions about not transmitting with the antenna closer than 2" to the body, and the like, and only with a 50% duty cycle.
FCC ID for the 300 is: O9GTSX300
The unit hops on 50 discrete channels, and each frequency is on for only .392 seconds at a time, repeat time being 20 seconds (roughly)