... operate 2.Dual line 4 digit display ,counting up or down 3.48*48mm 1.Feature of IBEST ... display ; Power fail holding function ,up to 10 years* Counting mode: counting up or counting down ,selectable by software* ... short circuit with +12V as signal input.Time modeTiming up or timing downOutput modeN, F , C, R Timer ... CONTACT US! IBEST ELECTRICAL CO.,LTD Counting Up or Counting Down , IBEST Dual Line 4 ...