The GDPLUS Solar Lighting System GD-8077 is a must-have for anyone who values energy efficiency and convenience. This system boasts a built-in 3.7v 4000MAH lithium battery and can be charged via DC 5V charging. With an 8-10 hour charging time, you can enjoy up to 6 hours of bright, eco-friendly lighting. The system comes with 3 LED bulbs and even includes a cell phone charging function. Say goodbye to costly electricity bills and invest in the GDPLUS Solar Lighting System today.