Welcome to the store! 1. [No external power needed] The memory test card supports all motherboards with DDR5 interface; no external power is required and it's easy to use. 2. [With indicator] LED lights are included for testing on the test card; you can determine based on light intensity. 3. [DDR5 memory] Compared to other memories, DDR5 standard offers higher performance and lower power consumption; this test card has more practical use. 4. [Long lifespan] Our memory test card is made of high-quality PCB board; the surface is specially treated for long lifespan. 5. [Main application] This test card can be used to repair motherboard issues like no startup, no screen, and no memory reading. It's an essential tool for repairing computer motherboards. Product type: RAM Memory Test Card Material: PCB Battery: 1 x CR2032 button cell (not included) Adjustment: DDR5 tester supports all motherboards with DDR5 interface and uses LEDs to indicate open circuit and short circuit of data line and address line Usage: Used for repairing motherboard issues like no startup, no screen, and no memory reading. It's an essential tool for repairing computer motherboards.