They have the model numbers incorrect in the Radio Shack listings.
Uniden Scanners - The RadioReference Wiki
The cheaper one should be: BCT15
The more expensive one (newest model) should be: BCT15X
There is no such thing as a BCT15XT, that's why you could not find any info on it.
I assume you got the older model if you bought the first one, the cheaper one.
I hope not.
Just called RadioShack customer support, and they guaranteed it was the BCT15X, and if it wasn't I could return it.
Here are the spec's from RadioShack's web site for the one I bought:
Tech Specs
Dimensions
Product Height 2 inches
Product Width 7 inches
Product Depth 6 inches
Product Weight 6 pounds
General Features
Model BCT15X
Product Type Scanners
Enclosure Color Black
Miscellaneous Features
Min Operating Temperature -4 Fahrenheit
Max Operating Temperature 140 Fahrenheit
Supported Languages English
Connections
BNC antenna (1)
Phone jack 3.5mm (1/8") stereo (1)
Phone jack 3.5mm (1/8") mono ext spkr (1)
GPS/Remote Interface Jack: D-Sub 9-pin (1)
Power Features
Power Device AC adapter; DC adapter
Radio System Features
Channel Scan Yes
Includes NOAA Weather Channels Yes
Includes SAME Alerts Yes
Weather Alert Yes
Radio Scanner Features
Scanner Type Triple trunking
Desktop Design Yes
Memory Channels 9000 Channels
Digital Coded Squelch (DCS) decoding Yes
Continuous Tone Controlled Selective Squelch (CTCSS) Yes
Follows Analog Motorola I, II, I/II trunked radio systems Yes
Follows GE/Ericsson (EDACS) trunked radio systems Yes
PC interface/cloning Yes