DROK 0-999999 Digital LED Automated Counters Electronic Conveyor Belting Store Visitor Counting 220VAC Adopts low power integrated circuit, high bright LED display with clear appearance. Has power off memory without machine damage, durable enough. aves data when power's interrupt: stored in a persistent memory (E2PROM). Sensor distance can reach 30 cm. Widely used in production, flow, rotation counting, length, times counting and so on.