C2G 35554 TruLink 2-Port VGA USB 2.0_PS2 KVM Switch - Manual (Page 6)

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LED Indicators
Host Indicators (RED)
ON: H ost PC is available and active.
Flash: Indicates which Host PC is selected but not powered on
HUB Switch with PC1/PC2 Indicators (GREEN)
Hub Switch with PC1 ON (Green) : All USB 2.0 downstream ports are connected to PC1
Hub Switch with PC2 ON (Green) : All USB 2.0 downstream ports are connected to PC2
Auto-Switch/Auto-Scan Indicator (GREEN)
ON:
Auto-Switch mode is active. The USB hub will switch with PC switching.
OFF: Auto-Switch mode is inactive. The USB hub switch is independent from PC and can
be controlled by hot key.
Flash : Auto-Scan mode is active.
PC1 HOST (RED)
PC2 HOST (RED)
HUB switch with PC1(Green)
HUB switch with PC2 ( Green ) Auto-Switch/ Auto-Scan ( Green )