Greenlee  1576 Data/Link ID And Cable Check Detects PC, NIC and HUB data transmissions and PC, NIC and HUB NLP or FLP pulse Identifies data and link transmission speeds with real time detection 100 MB or 10 MB Automatically scans with choice of slow or fast speeds Low battery detection on LAN ID tester Includes 2 RJ45 patch cords, 9V battery and durable, nylon carrying case with belt loop