HOW TO USE: MacBook Pro 2017/2016: please push in the hub hard enough to make sure the POWER LED at the front lit. Also place the provided leather case underneath the hub, making a steady connection. MacBook Pro 2018: please exert more pressure, especially in final 1mm of connection. (Due to Apple receiving numerous feedback about loose USB-C connections in earlier 2017/2016 MacBook Pro models, Apple decided to increase the tightness of USB-C ports in 2017 MacBook Pro and even more so in 2018 MacBook Pro models. It is perfectly fine to make the connection for the first time. Subsequent connections will be easier. We have tested ourselves numerous times and your MacBook will not be damaged in any way. ) Most Compact and Fastest (50Gb/s) Hub specifically designed for 2018/2017/2016 MacBook Pro, compatible with both 13" and 15" models. Expand the two USB-C ports on MacBook Pro into 7 ports. HDMI Video Output - 1080p @ 60 Hz up to 4k @ 30Hz Thunderbolt 3 - up to 5k or 2x4k @ 60Hz Video, Up to 40Gb/s data speed, Max 100W Power Delivery 2 USB 3.1 Gen 1 ports - 5Gb/s data speed, As well as high power to your devices USB-C port - 5Gb/s data speed SD/Micro card reader - UHS-1 104MB/s