Approximately up to what range do direct infrared systems operate?
A.
0.5 mile
B.
1 mile
C.
1.5 mile
D.
2.0 mile
Approximately up to what range do direct infrared systems operate?
Approximately up to what range do direct infrared systems operate?
A.
0.5 mile
B.
1 mile
C.
1.5 mile
D.
2.0 mile