?Stable and Smooth HDMI Output?Support Video and Audio display, the resolution up to 3840*2160(4K*2K)@30 Hz. VGA Output : The resolution up to 1920X1080P@60 Hz Tips: The HDMI and VGA port can NOT work at the same time. ?Two Usage Modes Mirror or extend the laptop/cellphone/tablet screen directly to the TV, monitor or projector. Increase efficiency of online meeting & home work. ?Advanced Aluminum Case Minimizes interference for stable video output, strong heat dissipation to protect your equipment from high temperature damage. Quick User Guide ?HDMI and VGA port can't be used simultaneously. ?Compatible with Thunderbolt(1st Gen) and Thunderbolt 2, DO NOT compatible with Thunderbolt 3/USB-C port. ?Only HDMI port could transmit audio and video, VGA interface could only transfer video. ?Apple devices released before April 2010 do not support audio out and will not transmit sound from Mini DisplayPort. ?ONLY support display video and audio from Mini Displayport equipped laptop/ desktop to TV/monitor/ projector, NOT HDMI or VGA to Mini Displayport. Thunderbolt 2.0 - Mini DP Compatible Devices ?2015 and before MacBook Pro, Mac Pro, iMac, Mac mini, MacBook Pro Retina; 2017 and before MacBook Air; ?Microsoft Surface surface pro 1 2 3 4 5 6, Surface 3, Surface Book, Surface Laptop 2, Surface Studio; Does not support Surface Pro 7/Surface Book 2/Surface Studio 2, since they do not have Mini Displayport. ?Lenovo Yoga, Lenovo ThinkPad X1 Carbon, X230/X240s, L430/L440/L530/L540, T430/T440/T440s/T440p/T530/540p, W530/W540, Helix; ?Dell XPS 14/15/17(before 2016), Latitude E7240/E7440, Precision M3800; ?Alienware 14/17/18; Acer Aspire R7/S7/V5/V7; Intel NUC; Asus Zenbook; HP Envy 14/17; ?Google Chromebook Pixel; Cyberpower Zeusbook Edge X6; B87Toshiba Satellite Pro S500, Tecra M11/A11/S11; etc.