•lights red when the keyboard battery power is low. The LED only flashes when a key is pressed on the keyboard while the batteries are low.
•flashes green slowly when the receiver is preparing to operate.
•flashes green rapidly when the mouse moves and goes off when the mouse stops.
•flashes green slowly when you hit a key on the keyboard and goes off when you stop.
2.The second green LED lights when Scroll Lock is set to on and turns off when Scroll Lock is released.
3.The third green LED lights when Caps Lock is set to on and turns off when Caps Lock is released.
4.The last green LED lights when Num Lock is set to on and turns off when Num Lock is released.
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