This device is a relay, working as cyclic timer (cyclic time relay). Operating mode is as follow: Work, Pause, Work, Pause etc… You can adjust working and pause time between 1 and 120 seconds or minutes.
When power is on (LED Power is on), the relay closed (LED Relay is on) and keep that position, until end of set ON time (Work), then relay is deactivated (LED Relay is off) for the set OFF time (Pause). When off time end - cycle repeat from beginning and so on. 
Work time (ON relay) and pause time (OFF relay) are adjusted independently. 
The two times are independent, ie be regulated separately. The time is from 1 to 120 seconds or minutes. 
Times is adjusted by two trimmer potentiometer. 
Potentiometer “WORK“ adjust devise working time - between 1 and 120 seconds or minutes. To switch between seconds and minutes use jumper. Settings must be done when power is off.  
Potentiometer “PAUSE“ adjust devise pause time - between 1 and 120 seconds or minutes. To switch between seconds and minutes use jumper. Settings must be done when power is off.  
Relay contact: 
- Normally open contact - NO. 
- Common contact - COM. 
- Normally closed contact - NC. 
Power supply - 240V or 12V DC. 
Relay: 15А/125V AC, 15A/24V DC, 10A/250V AC. 

Attention !!! 
Observe all rules for safe operation with high voltage when installing the device. 

This product is a boxed finished product.