The Wattstopper WS-301-I is a PIR wall switch occupancy sensor rated for 120/277V in ivory finish, providing automatic on/off control of lighting and fan loads based on occupancy and ambient light level in commercial offices, private offices, and small conference rooms. The passive infrared sensor fits a standard single-gang wallbox for straightforward retrofit and new construction installations. Dual-voltage compatibility supports both standard 120V and commercial 277V branch circuits.