Havis docking power supply Dell specific 90W power supply Adapters are housed in rugged abs cases sealed for durability. Output short circuit protection, safety current limiting. Internal temperature limit cut off circuitry. Automatic reset after cut off conditions return to normal. Under voltage and over voltage protection 15 amp fuse. Input cable 72 long with cigarette lighter adaptor. Output cable 41 long with integral Dell smart chip required for charging.