1、Suitable for laptop DDR234. 2、Using patch components, no hurt to your hands. 3、100% brand new and high quality 4、Reversed insertion or misinsert will not burn any parts after power on. 5、It is a good choice to repair the computer notebook. Description This diagnostic card is used for laptop DDR234. It is support both the laptop forward and reverse interface and using lightness and darkness of lead to stand for the sign of data line address. It replace the traditional way and become more effective. Features 1.Suitable for laptop DDR234. 2.Using patch components, no hurt to your hands. 3.100% brand new and high quality 4.Reversed insertion or misinsert will not burn any parts after power on. 5. It is a good choice to repair the computer notebook. Specifications PCB size: 6.7*4cm/2.64*1.57inch Usage 1. Insert 3.3V(CR2032) battery into the tester card and then put the card into the matched on the computer's motherboard. Turn off the power,  then the signal line is working if the lights is all works.  If some of lights do not work, it indicates that the signal line is normal,  if the light does not light or bright , Indicating that this signal has a short circuit fault,  with a test to further determine the point of failure. 2. If you wanna know DDR2 SDRAM SO-DIMM pin out, check the Manual. Package Included 1 x Tester Card 1 x Manual Note 1.Please allow 1-3 cm error due to manual measurement. Thanks for your understanding. 2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.