4.5. What do the different LED lights on the Frontier X Plus mean?
Fourth Frontier
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| Color of LED Indicator | What does it mean? |
| Three lights RED followed by GREEN followed by BLUE | Device bootup |
| No LEDs blinking | Sleep mode. Click to wake |
| Blink BLUE once in 2 seconds | Bluetooth ready to connect to App |
| BLUE and GREEN blink alternating | Bluetooth connected to App |
| Blinking GREEN every 2 secs | Record mode |
| Solid GREEN | - Live stream ECG - Activity summary sync - ECG Data sync |
| Slow GREEN blink with 4 sec ON and 4 sec OFF | Firmware update |
| Solid BLUE (while on charge) | Charging. Do not use to record |
| Solid GREEN (while on charge) | Fully Charged 100% |
| Blinking RED | Memory Full |
| Blinking RED | Low Battery (below 10%) |
| Solid RED | Device malfunction and the Frontier X Plus needs to be rebooted |