Funkwerk FT4 Operating Manual page 8

8 Instructions for use
Features and type designation
= Standard
L = Unit with "Position sensor" feature
S = Secury (personal emergency signal unit)
Nomenclature of type designation on the type decal
1 = Air Encryption TEA1
2 = Air Encryption TEA2
3 = Air Encryption TEA3
4 = Air Encryption TEA4
A = Explosion group IIA
B = Explosion group IIB
C = Explosion group IIC
a = Frequency 380 MHz ... 430 MHz
b = Frequency 410 MHz ... 430 MHz
c = Frequency 410 MHz ... 470 MHz
1 = 1 W
2 = 2 W
3 = 3 W
Ex = explosion-proof
= not explosion-proof
g = with GPS receiver
= without GPS receiver
i = with IOS receiver
= without IOS receiver