40GBASE-CR4 QSFP+ to 4X SFP+ DAC Twinax Breakout Cable, Passive, 1-Meter( 3.3 ft), 30AWG, 1 Pack. The length of the cable includes the connectors at both ends.; Compatible with Cisco QSFP-4SFP10G-CU1M and other open swithces.; All products are passed by TDR & VNA tests in our Signal Integrity Lab.; Widely used in data centers, storage area networks, Network Attached Storage, high performance computing, Rapid IO, Rack-to-Rack, Shelf-to-Shelf Interconnect, TOR (Top of Rack), etc.; 30 days free-returned, exclusive FREE 3-year warranty and free lifetime technical support.