DC 5V 12V 36V Trigger Counter Module Rechargeable Memory 4-Bit 0-9999 Red 0.56 Inches Digital Tube-Shaped Display with Shell CaseDescription:QF-C04 is a counter trigger. Each time you enter a trigger signal, the calculator adds one. Returns 0 when you press clear. Feature:1gt;. Wide voltage input2gt;. 4-bit tube-shaped digital display. Low Level Signal TriggerParameters:1gt;. Item Name: QF-C04 Trigger Counter Module2gt;. Model:QF-C043gt;. Operating voltage: DC 4.0V-40V4gt;. Working Mode: Trigger Mode5gt;. Trigger signal: low-level trigger (lt; 2V)5gt;. Display: 0.56" 4-bit red6gt;. Operating temperature: -25 C - 85 C7gt;. Operating Humidity: 0% - 95% RH8gt;. Size: 65*29*19mm Feature:1gt;. Each time you enter a trigger signal, the calculator adds one2gt;. Returns 0 when you press clear. Application:1gt;. Trigger counter2gt;. Industrial Control3gt;. Equipment ControlNote: If you choose the inductive module as the signal input, you need to choose the NPNG open type normally, the channels controlled by other microcontroller signals, low level is important, and lt; 2V is considered effective low level Package:1 x QF-C04 Trip Counter Module