---
title: LED Status Indication
description: Understand enDAQ sensor LED colors and patterns for charging, battery level, recording status, normal operation, and common device errors.
---
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September 25, 2026
# LED Status Indication
Dead Battery4There are three LEDs on the outside of an enDAQ sensor that are used to communicate battery level and operating state.
#### In this Article
- [When Connected to Power](https://support.endaq.com/article/145-led-status-indication#plugged)
- [During Operation](https://support.endaq.com/article/145-led-status-indication#operation)
- [Error Codes](https://support.endaq.com/article/145-led-status-indication#error)
---
### When Connected to Power
When the device is plugged into power the LEDs will initially go through a quick sequence of red and green, then blue, then red and green, alternating green and red, a blue flash, and finally, a solid LED state should appear. This LED display will indicate the battery level. This is also achieved during a battery status check which is achieved by holding down the button for 5 seconds until the LED turns off.
### Note:
When unplugging from power, the LEDs will perform a sequence as well that alternates quickly between green, red, and blue. This is normal before turning off.
---
### During Operation
\* S Series: A Blue Light blinking during operation indicates IMU is not calibrated.
\* W Series: A solid Blue Light while recording indicates that the GPS is on but has not yet secured a lock with the satellites.
\* W Series: A rapid blinking Blue Light while recording indicates the GPS is on and has secured an accurate lock with the satellites
### After Recording is Finished | W Series
### Error Codes
When initially connected to power the device will perform a self-check test. If something fails, the red LED will methodically and slowly blink. This is an indicator that something is wrong and the unit may be permanently damaged.
| Code (# Blinks) | Error | Description |
| --- | --- | --- |
| 2 | Sensor Problem | A sensor has failed to initialize. See self\_test\_log.txt in the device’s System folder for more information. |
| 3 | Dead Battery | Battery fully discharged. Plug into USB to charge or operate on external power source. |
| 4 | SD Card Error | SD card not present or could not be initialized. Reformat or replace SD. |
| 5 | SD Card Full | SD Storage full. Delete files to make more room. |
| 6 or more | Device Error | [Contact our customer success team](https://endaq.com/pages/contact-endaq-customer-success) for assistance. |
### Note:
On older firmware versions, 5 blinks represented a problem with the low power accelerometer. If you have an older device and experience this error, [contact our customer success team](https://endaq.com/pages/contact-endaq-customer-success).
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