Arrow points to LED located at the center of the power meter housing

Each Stages Power L and Stages Power R power sensor has an LED indicator located in the center of the power meter housing that indicates the status of the power meter. Note: Gen 1 and Gen 2 Stages Power meters do not have the LED indicator light on the power meter housing. 

At startup, the power meter's LED light will blink based on the battery level: Green (6-100%) or red (1-5%) flash to indicate battery level every 10 seconds for the first minute after startup. For LR, the left sensor will flash the left, then right battery level in succession.