The Wattstopper EM-24D2 is a DC low voltage photocell engineered for automatic daylight-based control of exterior lighting in commercial and site lighting applications. Compatible with Wattstopper power packs and lighting control panels, it provides dependable dusk-to-dawn switching to reduce energy use and minimize manual intervention. It integrates directly into Wattstopper’s low voltage control ecosystem for contractors and specifiers working with DC-based control architectures.