?5 Warranty? We offer a 5-year warranty and free repair or replacement for modules with manufacturing defects, as well as a 60-day exchange policy and a 30-day refund policy for compatibility issues or other reasons. We cover shipping costs for exchanges within 60 days of purchase, and provide a full refund for returned modules within 30 days of purchase. ?Easy to install? It supports real-time configuration, plug and play, hot pluggable sfp footprint. It doesn't require any setup or installation for either device. It greens up immediately and connects right away. ?Application? It's able to use on all HPE ProCurve Series and HP Aruba Series 1000BASE-T 1.25Gigabit Ethernet 1G switches, Servers, Routers, NICs and other transmission equipment for Enterprise LAN Networks in data center and other cooper networking connections, and are rigorously tested to ensure reliable performance that meets or exceeds industry standards, while the information displayed may slightly vary from the original products. ?1G SFP RJ45?1000BASE-T SFP Fiber Optic Transceiver Module over Cat5 Cable, 1.25Gb/s Copper SFP, 100 meters, 1.25Gbps, SFP to RJ45 connector, hot and play, auto-negotiation, MSA Compliant, IEEE STD 802.3 and 802.3ab, 0 to 70°C (23 to 158°F). ?99% Compatible?for HP X121 1G SFP RJ45 Transceiver, especially for HPE Aruba and HPE ProCurve Networks gigabit ethernet 1000BASE-T standards, coding and writing as HP ProCurve J8177A/ J8177B/ J8177C/ Aruba J8177D J8177DCM JL747A.