Our solar portable lights integrates solar panels, battery, electronics, and LED light source into a compact, stand-alone unit, which makes them a self-contained and care-free light units and with MPPT (Maximized Power Point Tracking) microcontroller enable these lights to maximize solar power output. . The rugged design of these self-contained lights ensures up to 5-8 years of reliable service with minimal ongoing maintenance. Specifically designed for the harshest of environments.Optional wireless controller provides on-demand operation from up to 5 km away.