Photocontrols install within lighting fixtures, post lamps, in-wall boxes, or on electrical boxes to provide dusk-to-dawn on/off control of outdoor lighting. They are designed to be weatherproof and operate even at extreme hot and cold temperatures. Photocontrols are commonly used in conjunction with fluorescent, incandescent, and HID-type lights and fixtures.

Intermatic's model K4221C is sold in multiples of 1. It comes with a standard manufacturer's warranty, and its UPC is 078275002029.