This Grasslin 115/230V 24 hour/ 7-Day spa and hot tub panel mount time clock with manual override switch has a black dial and white timer tabs. Pull out the tabs to shut OFF the spa pump or other device, and push in the tabs to turn ON. The simple plug-in timer has four screw holes in each corner for mounting and five wire tabs on the bottom for power connections. The 34-0057 Grasslin Time Clock also has movable hands in the center of the time clock dial for ease of use and understanding.