美国采购需求：电子、电力桩定时器、远程光电定时器

I recently purchased a digital stake timer with six outlets and seven programmable timers, but I'm a bit confused about the setup. The instructions don't clarify which outlet corresponds to which program, nor do they specify what the seventh timer is for. I've been searching online for clarification but haven't found much help. Any additional information or guidance you could provide would be greatly appreciated. Thanks in advance!