["for DC 5V 12V 36V Trigger Counter Module Accumulator Memory 4-Bit 0-9999 Red 0.56in Digital Tube Display with for Shell for Case\n\nDescription:\nQF-C04 is a trigger counter. Each for time input a trigger signal, the calculator adds one. Returns 0 when press Clear button.\n \nFeature:\n 1>.Wide voltage input\n 2>.4Bit Red digital tube display\n 3>.Low level signal trigger\n \nParameters:\n 1>.Item Name:QF-C04 Trigger Counter Module\n 2>.Model:QF-C04\n 3>.Work voltage:DC 4.0V-40V\n 4>.Work mode:Trigger mode\n 5>.Trigger signal:Low level trigger(<2V)\n 5>.Display:0.56\" 4bit Red\n 6>.Work Temperature:-25℃~85℃\n 7>.Work Humidity:0%~95%RH\n 8>.Size:65*29*19mm\n \nFunction:\n 1>.Each for time input a trigger signal, the calculator adds one\n 2>.Returns 0 when press Clear button.\n \nApplication:\n 1>.Trigger counter\n 2>.Industrial control\n 3>.Equipment inspection\n\nNote:\nIf you select the induction module as the signal input, you need to select the NPN normally open type\nWhen controlled by other microcontroller signals, the low level is valid, and <2V is considered to be an effective low level \n\nPackage:\n1pcs QF-C04 Trigger Counter Module"]