Unique waterproof design, essential tool for camping and wildernessNo need to add any batteries, new concept of saving money and environmental protectionComes with 12 long-lasting strong light LED bulbs (optional 4/8 or 12 bulbs)Can illuminate for about 15 hours (if 4 LED bulbs are selected)Can illuminate for about 10 hours (if 8 LED bulbs are selected)Can illuminate for about 5 hours (if 12 LED bulbs are selected)Solar charging takes 14 hours and can provide lighting for about 15 hoursManual charging takes 4 minutes and can provide lighting for about 1 hourBuilt-in long-life NI-CD/MH (3.6V / 500mAh) rechargeable batteryComes with hand pull function, convenient for portable lighting outdoors and indoors