This unit has no clock, only a timer. Feeding dish does not rotate at proper timer intervals and sometimes rotates two spaces at a time. In addition, you have to use a Phillips screwdriver to change the batteries, which is ridiculous. I bought two, and returned them both. We currently use the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Ergo-8-Day-Auto-Pet-Feeder/dp/B0008173UQ/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Ergo 8-Day Auto Pet Feeder</a>, which works much better.