DC 12V 20A programmable digital relay delay switch module describe: Please be careful on your first use. You need to wait 6 seconds after setting the data. After 6 seconds, the module will save the data you set. Short press the "SET" key: start the hour setting mode, the display flashes. Please adjust the T1 time by flashing. Press the "SET" button and the screen will flash again. Set the flashing time T2. Then use both methods to record together: 1. Wait 6 seconds for the screen to stop flashing. The system automatically saves the set time; 2. Press the “SET” key. Long press the "SET" key: start the setting mode. There are parameters to choose from: P0 and P1. Short press "SET" to select P0 or P1. Under the P0 and P1 parameters, you can use the up and down keys to adjust the parameters. Reset button: Reset function. After the timer expires, it can work normally. If you need to work again, short press the "Restart" button to restart the timer. Package contents: 1 piece relay