To help maximize the battery life of your keyboard, the green LED of the Caps Lock key will only stay on for approximately 2 minutes while the keyboard is idle. However, the Caps Lock key will still be engaged, even though the LED is off. When you begin typing, the LED should light again.
Apple Wireless Keyboard: About the Caps Lock LED
Learn about the power-saving feature of the Caps Lock LED on Apple Wireless Keyboards.
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