The Wattstopper InteliSwitch TS-400-B is a 120/277VAC digital time switch in black, rated for 0800W incandescent or 01200W ballast loads, designed to automatically shut off lighting after a preset interval in commercial and institutional spaces. Pushbutton operation enables simple countdown timer activation without external programming, reducing energy consumption in offices, conference rooms, and corridors. Dual-voltage compatibility at 120/277VAC supports use across a wide range of commercial wiring configurations.