The timer functions and time ranges are easily selected by setting external switches. The knob on the front of the timer is used to set the precise delay period within the selected time range. Timer functions RTE-B1/RTE-P1 are power-triggered and include ON-Delay, Interval, OFF-Cycle, ON-Cycle. Timer functions for RTE-B2/RTE-P2 are signal triggered and include ON-Delay, OFF-Cycle, OFF-Delay, ON-Cycle and Single-Shot.