ULTRADRIVE Kit USB-C Dual-Display Modular Dock Perfect for MacBook - MacBook Air - MacBook Pro 8-in-1 Functions: Each module can work separately as a stand-alone mini adapter or be magnetically attached for use together with the main body. Main Body of Dock: USB-C to 4K 30 Hz HDMI USB 3.1 Type-A Gen 1 port supports 5 Gbps of data transfer USB-C Power Delivery 3.0 charging up to 100W USB-C 3.1 Gen 1 supports 5 Gbps of data transfer 2 Magnetic Kits: USB-C to 4K HDMI : resolutions up to 3840 x 2160 60 Hz USB-C to SD -microSD 3.0 memory card reader-writer slots for external memory cards up to 2 TB Dual-Monitor Setup: Create a dual-monitor setup when the main body is used with the USB-C to 4K HDMI kit