With this adapter you can connect newer Thunderbolt 3 computers to legacy Thunderbolt devices such as external hard drives Thunderbolt displays & older Thunderbolt capable Mac computers Newer Thunderbolt 3 computers include the latest models of Dell Precision & Dell XPS Because this adapter is backward compatible you can connect to first-generation Thunderbolt devices at 10 Gbps speed With Thunderbolt 2 devices you can connect at 20 Gbps The adapter supports bi-directional data transfers & simultaneous power delivery for bus-powered devices The product is backed by a 2-year warranty for guaranteed reliability Note This adapter is compatible with Thunderbolt displays only It will not work with Mini Display Port (m DP) or Display Port (DP) monitors Connectors Thunderbolt 3 USB (Universal Serial Bus)-C (24-pin) Male Thunderbolt 2 (20 pin) Female Physical Characteristics Color Black Product Height 16 mm 06 in Product Length 280 mm 11 in Product Weight 64 g 23 oz Product Width 59 mm 23 in