Specifications:

Battery Guard With USB Port and Socket
Protects your battery from being drained completely
Suspends power to 12/24 volt accessories when battery  voltage drops
LED indicators
Input: DC12-24V
Output: USB port 5V 2.1A (total)
2 USB ports
socket 12/24V
Maximum output current 8A
Extra long 10-foot power cord
with CE & ROHS
Packing:

double blister
carton size:48*44.5*53cm/6pcs/inner box/72pcs/ctn