Operating instruction:
A. Voltage selection:
1. Proper output voltage setting. Please check the voltage indication marked next to the input jack on your laptop. You may find the voltage in your AC adaptor or in the computer user's manual.
2. Set the voltage switch on the body of the adaptor into the corresponding voltage of your laptop.

B. Tip polarity selection:
1. Select a proper connector size. The polarity of the connector plugs is presented with the positive tip in centre.
2. Insert connector output plug into your laptop
3. Insert adaptor into Jack
4. Turn on laptop

 Turn on computer. If it dose not operate, immediately disconnect and review the abover steps.

Compatible allmost all of Laptop with the following brands.

Our factory: 
5,000 square meters
150 well-trained staff
18 R&D engineers
18 QC auditors
4 SMD workshops, imported equipment from Japan
2 semi-automated production lines
500K/M current monthly capacity
ISO9002 quality assurance
UL/CUL , CE, FCC, CCC, KC, GS, TUV , C-TICK , SAA,CB, ROHS approvals , 6 level efficiency .

Our principle: Lowest price and GOOD quality .