1) long life span 50, 000hrs
2) power sources: Rechargeable batteries and 4 * AA batteries
3) car adaptor, AC adaptor, PC, HUB and laptop, etc. (excluded)
4) leds quantity: (4, 16, 28LED) with 3-shifts switch
5) after full charge, 35hours for 4 LEDs, 8hours for 16 LEDs and 5 hours for 28 LEDs
6) flexible pipe and adjustable at your will
7) both charge socket for DC 5V and DC 12V
8) red LED indicator for charging and green one for full charged