1) Single line 4 or 6 digit LED to display counting value;
2) With thumb swtich for setting preset value;
3) With 1 digit LED to display delay output time;
4) With 3 buttons for setting delay output time, output mode and reset;
5) 4 optional output mode, fulfill different counting requirment;
6) Delay output time range: 0.2S to 15S.