!!
critical Logitech
Error Code Red LED pulsing
Critical battery level — requires immediate attention.
? What Causes This
Battery is at a critical level and needs to be replaced.
✓ How to Fix It
- Open the battery compartment.
- Replace the AA alkaline battery.
- Close the battery compartment securely.
Source: page 7 of the official manual
From the manual
This error code appears in:
Logitech M650 Full Size Wireless Mouse