Voltage (output)， current (output)， DC Interface Description:

1， voltage: voltage adapter MUST be consistent with the first wife.

2， current: An electric current can be compatible with a large number of small number of (large current compatible small current) security， not vice versa (small current can not be used on a large current). Ann is a large number of power， power is calculated by multiplying the voltage is equal to the current power products， so you must increase the power requirements of current increases， because the voltage is constant. Why buy a large power supply， because the original design of the adapter according to the standard， but the actual use laptop more external devices， it requires power adapter， or adapter for a long time can easily lead to burn out the work load， which is particularly reflected in the Internet the more obvious. So sometimes buy a large number of security to replace the original adapter is also very necessary. For example: 19V 4.74A adapter can replace 19V 3.42A adapter， not vice versa.

3， DC Interface: DC Interface sure consistent with the original adapter. Here that the interface is a DC power adapter DC jack， which is inserted into the connector Laptop Power hole. DC interface type more， the shop each adapter parameters described which has said， for example: 5.5 * 1.7mm， means: DC interface outside diameter: 5.5mm (mm)， an inner diameter of 1.7mm (mm).