With Panasonic QM4H it is possible to set and change the time with front digit switches easily during the power off. Furthermore single unit has a time range of 0.01s to 9990hrs! QM4H-S type can select the mode with MODE switch. Selectable 8 different time ranges with front digit switches. Set the reset inputs (1) to (3) and stop inputs (1) to (4) to 20 ms or higher. When shorting a signal, please set the inter-terminal resistance to 1 kohm or less, and the inter-terminal residual voltage to 2 V or less. When releasing, please set the inter-terminal resistance to 100 kohm or greater.