Principle and Introduction: It is a timer and a electromagnetic counter. It is mainly used in the lift industry to record the running time of elevators and elevator opening times. Accordingly, it provides a basis for the normal maintenance of the elevators to facilitate the safe operation of elevators. The product can also be applied in the machine tool industry, or in other industries needing the counting also the timing. Counters and timers can choose AC or DC power supply. When a pulse signal is sent, the counter makes a number counting, while the timer accumulates time after power. The minimum time potential of timer is 0.01 hours