... signal input "+" and "-" First:as counter,can add or minus button or remote control ... counterhave two signal input “+” and “-“Specification:First:as counter,can add or minus.Second:1, Led high of ... character:8" red led digital display.2, Power wire: length 1.5M3, Remote control:infrared ... pulse signal, have one add“+" and minus”_"2, Operation can be operated by push button,remote control ...