ThinkPad Laptop Car Charger. AC/DC Combo Adapter. Good Condition.

5.5mm/6mm - yellow plug into laptop

AC Power 

input-100-240 vac 2A 50-60Hz

output- 16 VDC 0-4 55A

DC Power 

input- 10.5-18 VDC 8A

output- 16vdc 0-4 55A