DIGITEN 0-999999 Digital LED Counter +PhotoElectric Switch Sensor +Reflector Automatic Conveyor Belting 100-220VAC Power requirement:AC/DC100-240V Stronger photoelectric sensor come with reflector, detection distance up to 2m 6 Digits RED led counter, it is very accurate Data be retained when power failture This kit can detect most of object, for example, metal,plastic,glass,book,clothes,bag,wood,people,etc