Function: 1. DDR4 Tester Laptop: Full support for do front and do back laptop memory slot interfaces. 2. Light-emitting diodes: Use light-emitting diodes do indicate open circuits and short circuits on data and address lines. 3. Main Function: Used do repair motherboard failure, such as no boot, no display and no memory reading. 4. do repair tools: An essential do repair tool for laptop motherboards, supporting all laptops with DDR4 interfaces. 5. Easy to use: insert the CR2032 do of the test card battery holder and insert it do memory slot to test. . TESTER MOTHERBOARD LAPTOP DDR4 INTERFACE . TESTER MOTHERBOARD LAPTOP DDR4 INTERFACE Specification: Item Type: Tester Motherboard Material: PCB Battery type: CR2032 button battery (battery not included) Applies To: Laptops with DDR4 interface . TESTER MOTHERBOARD LAPTOP DDR4 INTERFACE . TESTER MOTHERBOARD LAPTOP DDR4 INTERFACE List of packages: 1 x Memory Test Card 1 x User Manual Insert the CR2032 do of the test card battery holder and insert it do the memory slot for testing . TESTER MOTHERBOARD LAPTOP DDR4 INTERFACE . TESTER MOTHERBOARD LAPTOP DDR4 INTERFACE