Motorola RMU2080 User Manual page 57

Symptom
Heavy static or interference
Low batteries
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Radios are too close; they must be at least five feet apart.
Radios are too far apart or obstacles are interfering with transmission.
Refer to "Talking and Monitoring" on page 26.
Recharge or replace Li-Ion battery.
Extreme operating temperatures affect battery life.
Refer to "About the Li-Ion Battery" on page 14.
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