Feature: 1. APPLICABLE SCENARIOS: Professional desktop computer DDR4 memory test card, suitable for desktop computer DDR4 memory test. 2. COMPUTER MEMORY FAILURE: Computer memory failure is mainly due to poor contact of gold pin, gold pin wear, PCB damage, data line damage, open circuit, short circuit of memory, bad memory, ETC. 3. LED INDICATORS: LED indicators are used to test all data lines of the memory. Normal brightness is considered normal. When there is a hardware failure in the loop of these data lines, either on or off is abnormal. 4. PURPOSE: If the test indicator blinks, the gold pin has poor contact. If the indicator does not light up, there is a broken hardware fault. Check the wear and tear of the gold needle to rule out damage and whether the PCB is disconnected. 5. EASY TO USE: Insert the CR2032 battery into the battery holder of the test card, or connect the USB C cable and then insert the memory card for testing. Specification: Item Type: DDR4 Memory Tester Material: PCB Color: Green Battery: 1xCoin Cell CR2032 (Without) Power Input Port: USB C Applicable: DDR4 Memory Test . Package List: 1 x Test Card 1 x USB Cable4 x Fixed Seat