Increase the supply anti- reverse function. Set parameter after power for perdurable memories. Signal terminal voltage signal can be maintained for a longtime. To ensure the stability of industrial grade board, class PLC. Size: 64.2mm x 34.8mm x 18.5mm/ 25.28 inch x 13.7 inch x 7.28 inch Working mode selection:After power on,long press K12 seconds later into the select function mode,P1-1~P1-4 for choose. bit digital tube starts flashing,then press K3,single-digit change;then click K2,digital pipe does not blink,then press the K3,shifting the decimalpoint,the decimal pointin abitindicates 0-999minutesin ten represents 0 to 99.9 seconds withou tadecimal poin trepresents 0-999 seconds;goodchoice,bringing the time setting is completed. P1-2 operating modes:Asignal trigger ,digital countdown begins,X seconds after,there lay open Y seconds,then close. Users can set the relay time X,Y;P1-1different time settings similar to the blue lights that set the relay time,blue light indicates setting relay off time. P1-3 operating modes:Open X seconds,disconnect Yseconds,infinite loop.Users can set the relay timeX,Y;time setting similar to P1-2. Relay Specifications:AC 220V 10A or DC 30V 10A. Quiescent Current:20mA,Operating Current:50mA. Working voltage:10~16V(if other ranges can be customized). Signal voltage:4V~20V(if other ranges can be customized). Life:about 100,000 times Working temperature:-40~85'C. Material: printed circuit board Package Includes: 2 x DC12V Delay Timer Control Switch Module