So-myshtech DC 12V LED Display Digital Delay Timer Control Switch Module PLC Automation It's a new digital LED countdown display 12v delay module module. It can be widely used with various It can set the delay time,can press "set" buttons.After setting up, power-up setting value is previo It's precision delay, error 0.01% per second, a delay of 0-999 seconds , LED changes per seconds ; LED digital display, normally open trigger delay 12V relay module, triggered by an external signal. Modules are high level trigger, counting time 0-999 seconds.