Features: Products fully support the notebook forward and reverse slot interface, is the use of light-emitting diodes and light to indicate the data line address lines and other signals open and short circuit, instead of the traditional method of measuring with a universal meter, used to repair not boot, Do not show, do not read the memory and other failure of the motherboard, is to repair the computer notebook motherboard essential tools. Specifications: In the tester installed 3.3V (CR2032) battery, respectively, into the corresponding notebook motherboard every DDR3 memory slot, the motherboard without power, the test light is full and brightness consistent, indicating 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 multimeter to further determine the point of failure. Note: The various signals of the tester, due to the manufacturers of the motherboard design and chipset of the different parts of the signal may show different, please compare to the same motherboard to determine the fault. PCB size:6.7*4cm/2.64*1.57inch No Retail Packages Quantity: 1Set Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package include: 1 * tester card 1 *instruction