"High and Low level trigger selection:Trigger Current: 2-4mAHigh Trigger Level: 4.5 - 12VLow Trigger Level: 0 - 4VHigh Trigger Selection: H and com end in short circuit by jumper terminalLow Trigger Selection: L and com end in short circuit by jumper terminalInput Interface:DC+: DC 12V power supply positiveDC-: DC 12V power supply negativeIN: corresponding with trigger signal level of relayOutput