This product is designed to test notebook motherboard memory slots, using LEDs to indicate signal status for open or short circuits, replacing traditional multimeter methods. It helps diagnose issues like no boot, no display, or memory read failures. Insert the tester (powered by a 3.3V CR2032 battery) into DDR5 slots on an unpowered motherboard. If all lights are evenly lit, signals are normal; if not, a short circuit may exist, requiring further multimeter checks. Note: Signal indications may vary due to motherboard design differences��compare with the same model for accurate diagnosis. Appearance may differ slightly by batch but does not affect functionality. Color: Green Material: PCB Package includes: 1 x Laptop Motherboard Memory Tester Card Disclaimer: Slight color variations may occur due to lighting or display settings. Measurement tolerance: +/- 1-3cm.