Complete solar lighting system with solar panel, USB port battery for device charging, 3 LED lamps. Use the included solar panel to charge the rechargeable internal battery. Capable of providing 8-10 hours of autonomy for continuous use of the lamps. It contains 4 ports for the 3 lamps in the package. The extra port can be used either as a backup or for an additional similar lamp. (a fourth lamp is not included in the set).