PRESET COUNTER 1:2,3,4 digits display with 7 segment LED display 2:Contact input, proximity or photoelectric switch compatible PRESET COUNTER1, 2,3,4 digits display with 7 segment LED display2, Contact input, proximity or photoelectric switch compatible3, To reset the counter by cutting the power or shorting contact (1+3)4, Memory function availablePlease contact Ms.Amy YIN --- yinamy9@gmail [dot ...