Product Description:
This high power DC adapter is designed to power the popular brand laptop notebook computers which require DC input from 15V to 24V while you are traveling in the car. The adaptor features overload and short circuit to protect it form damage. This includes 8 of the most common plugs, the adaptor works with almost all laptops (please check the pin size with the size guide below before purchasing) with a round barrel type power connector including Sony, Dell, HP Compaq, Acer and IBM laptops with the pin in the middle of the barrel. 
Features/Specifications:
• Auto DC Power Regulated Adaptor For Laptop with adjustable output voltage.
• Plugs this DC power adapter into your 12V cigarette lighter socket and charge your laptop whilst on the move.
• Input: DC 11-14 volts. Output: DC 15/16/18/19/20/24V 3.5A max .
• 8 interchangeable tips for flexible adaptability to different notebook models including Sony, Dell, HP, Compaq, Toshiba, Acer, IBM. (Please refer to size guide below)
• Connector Size Guide:
 4.0mm (External Diameter) x 1.8mm (Internal Diameter) x 10.8mm (Length)
 4.8mm (External Diameter) x 1.9mm (Internal Diameter) x 9.7mm (Length)
 5.0mm (External Diameter) x 3.4mm (Internal Diameter) x 11.8mm (Length)
 5.5mm (External Diameter) x 1.5mm (Internal Diameter) x 12.8mm (Length)
 5.4mm (External Diameter) x 2.1mm (Internal Diameter) x 12.6mm (Length)
 5.5mm (External Diameter) x 2.5mm (Internal Diameter) x 12.9mm (Length)
 6.3mm (External Diameter) x 2.9mm (Internal Diameter) x 13.3mm (Length)
 5.9mm (External Diameter) x 4.3mm (Internal Diameter) x 13.9mm (Length)