Features The product has memory function, the data will not lose when power off With 4-digit digital display, the display range is 0-9999 Wide voltage operation, support DC4-40V Adopted of high quality electronic components, and accuracy process, ensure for the durability With accumulated +1, clear, power off data memory function Feature: 1. The product has memory function, the data will not lose when power off 2. With 4-digit digital display, the display range is 0-9999 3. Wide voltage operation, support DC4-40V 4. Adopted of high quality electronic components, and accuracy process, ensure for the durability 5. With accumulated +1, clear, power off data memory function Specification: Item Type: Counter Module Working Voltage: DC 4-40V 4-digit Counter Counting Range: 0-9999 .w-e-text table td,.w-e-text table th,;.w-e-text table, Package List: 1 x Module Note: 1. External sensor must be NPN normally open 2. The positive pole of the module is connected to the positive pole of the power cord, the other is connected to the negative Package List 1 x Module