An affordable, more accurate alternative to expensive or unreliable timers and photo controls. LightMaster™ offers true dusk-to-dawn lighting control, with ambient light level sensing.• Easily control indoor and outdoor lighting, as well as automatic awnings or shades. • Each LightMaster™ Light Sensor Control includes a LS2 Dark Sensor, which monitors ambient light and can automatically adjust light levels throughout the day. Detects 10 to 1,000 foot-candles, with a 0 to 100 second delay to eliminate nuisance switching on and off. • Add on Single Channel or Double Channel Relays, which also each include a LS2 Dark Sensor, to your Light Sensor Control to customize your LightMaster™ setup to your entire building or area. • LS2 Dark Sensor can be mounted up to 330" away from Light Sensor Control for convenient operation. • 120 V AC. NEMA 3R rain-tight enclosure allows installation indoors or out. • Ideal for greenhouses, barns, offices, parking garages, security lighting, daylight harvesting, walkways & driveways, industrial yards, manufacturing facilities, warehouses and more!