It is programmable using the four buttons onboard， to set up to 18 customized modes， including automatically repeating a set time cycle.The 18 modes include: close or disconnect upon a certain set time; cycle mode 1 and 2 (cycle time 0 second to 270 hours); self-lock relay mode; trigger relay mode; limited cycle mode 1 and 2.It can be adjusted between a delay time of 0.01 second ~ 99 days 23 hours. Description:100% Brand New And High QualityAuto protection against faulty wiring: will not damage due to wrong connection of polarity;Function increased from 8 kinds to 18 kinds.Minimum time setting enhanced from 1 second to 0.1 second. Input voltage: DC12VControl voltage (NO��: AC 0~250V / max. 10A， DC 0~30V / max. 10AControl voltage (NC��: AC 0~125V / max. 10A， DC 0~28V / max. 10ASize: Approx. 6.5x4cm / 2.6x1.6"Connections:Control Side:DC+ : 12V positiveDC-: power in negativeCH1: signal inputOutput side:NO: normal open (before relay closes， this pin is not connected. after relay closes， the pin short-connects with COM)COM: CommonNC: Normal closed (before relay closes， this pin short-connect with COM. after relay closes， the pin is not connected )Package includes:1x Relay module