How does the Low-Battery Indicator Light work?
When a battery reaches a certain level, the oscillation frequency declines and the system is no longer capable of delivering the optimal shave. The microchip inside Gillette Fusion ProGlide Powerâ„¢ senses when the battery is approaching this level. When this happens, the Low-Battery Indicator Light begins to flash, signaling that it’s time to change the AAA battery.