Shure BLX2 - Back Panel; BLX1 Transmitter Details

Shure Incorporated
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⑦ Battery Compartment
Transmitter LED Indicators
LED Indicator Status
Green Ready
Rapidly Flashing Red Controls locked
Solid Red Battery power low (less than 1 hour remaining*)
Flashing Red and shuts off Batteries dead (change batteries to power on transmitter)
*For alkaline batteries only. For rechargeable batteries, solid red means the batteries are dead.
Single System Set Up