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> Use this file to discover available pages before exploring further.
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# LED colors and sounds

The lock button on your TMD Chain Lock uses different colors and sounds to provide feedback on what is happening. In this article you can see an overview of all of these.

| Event | LED behavior | Sound |
| ---- |
| Lock is opening | Green light | One beep |
| Alarm is arming | Two white flashes | Two beeps |
| Alarm is disarmed | One short green flash | One short beep |
| Pre-alarm (warning on movement) | Three long red flashes | Pre-alarm sound |
| Full alarm | Short red flashes | Alarm sound |
| Connection with lock established | Blue light for 5 seconds | No sound |
| Connection with lock lost | Two blue flashes | No sound |
| Battery is low (<20%) | Three orange flashes | Three beeps |
| Lock is charging | White rotating light, every 3 seconds | No sound |
| Lock is fully charged | No lights | No sound |
| Firmware is updating | White rotating light | No sound |
| Firmware update completed | One long flash | One long beep |
| Firmware update failed | Three long red flashes | Three long beeps |
| Emergency code entered incorrectly | Three short red flashes | Three short beeps |
| Emergency code security delay active | Three short red flashes | Three short beeps |
| Emergency code cancelled | No lights | One short beep |
| Something is wrong (contact support) | Three short red flashes | No sound |