C74 is the easiest to operate of all the On-Time feeders. Set up requires a one time plug-in of two 9 volt alkaline batteries at 12:00 o'clock noon. This initializes the C74's invisible clock. When plugged in at noon, the unit will feed at a factory pre-set time of 7:00 a.m. and 4:00 p.m. and a factory pre-set run time of 8 seconds per feeding. Approximately one pound of corn will be thrown per feeding. Optional controller: Plug controller in, program, then unplug and take it with you. C74 remembers everything. Own many C74's and own one controller.