1. off grid solar system, for home lighting, and with USB mobile charge function
2. With 4 set LED bulb(with on/off switch and LED holder), can light up 4 rooms 8 hours at the same time
3. LED lighting and mobile phone charging in one device
4. The charge controller- over-charging, over-discharging protection
5. Easy replaceable 2600mAh lithium battery
6. 2 years warranty.