SunLight 20L-12V Charge Controller Morningstar�s advanced SunLight solar lighting controller combines the SunSaver design with a microcontroller for automatic lighting control functions. This Technology Provides: • Proven Reliability • Precise Lighting Control • PWM Battery Charging Operation: Rotary digital switch to select among 10 lighting options (see back) • Test button flashes red LED to confirm correct rotary switch selection • Test button turns lights on for 5 minutes (in LVD limited to 3 times) • LVD overrides lighting timer • Sunrise overrides lighting timer • Timer accuracy is within 2 seconds