242-5(MFK-ABC-xxD)
242-5(277-860-GB4)
M (Model)
2 - 51SL series
F (Frequency Band)
7 - 700-800 MHz
K (Keypad)
7 - Intrin Safe, DTMF keypad (all models)
A (Antenna)
8 - 800 MHz
B (Battery)
6 - Intrin Safe, ultra high cap NiMH
C (Front Housing Color)
0 - Black
xx - Software enabled features/options
These “xx” letters indicate other operating protocols
and options that are enabled by factory
programming. Options may include encryption,
OTAR, 512 Talk Groups, Digital SMARTNET/
SmartZone, AES encryption, and others. Use the
Transfer > Read Options From Radio menu