This handy gadget grows your USB-C port on your laptop or some smartphones into an 8-way hub.  
1: HDMI
2: USB 3.0 (backwards compatible with 2.0/1.1)
3: USB 3.0 (backwards compatible with 2.0/1.1)
4: USB 3.0 (backwards compatible with 2.0/1.1)
5: LAN (RJ45/Ethernet) - 10/100/1000 Mbps
6: PD (Power Drive) Charging Port: Charge laptops/phones while plugged in or provide additional power to device (up to 100W)
7: SD Card Port
8: Micro SD Card Port
[More geeky details below]

The USB C adapter dock has useful tapered design case, small size and light weight. It is great for travel. The USB C docking station easily installed, no external software, drive, or additional power source is needed -  plug and play!

Physical parameters:
  • Product Name: Premium 8 in 1 Multi-port USB-C hub Adapter Converter for laptops / Smartphones.
  • Type C to HDMI +USB HUB+ PD + Card reader + RJ45
  • Adaptor Material: Aluminium alloy 
  • Product size: 105*50*16mm; 
  • Net weight: 77±0.5g 

As promised, the more technical details of each port/adapter:
  • 1*HDMI, Support standard HD4K/30Hz(3840*2160P), compatible with 1920*1080P;
  • 3* USB 3.0 Female, Support data transfer with speed 5Gbps, backward compatible with USB2.0/USB1.1
  • 1* Micro SD /1* SD, support data transfer with speed 480Mbps, backward compatible with USB1.1
  • 1* Type-C PD charging, support PD3.0 protocol, power up to 100W;
  • 1* Rj45 Lan port, supports 1G high-speed transmission.

HDMI Functions:
  • Mirroring: USB C to HDMI port can Mirror or extend display of your laptop or some mobiles to your TV, monitor or projector.  It supports 4K/30Hz. It is compatible with 1920*1080P.
  • Samsung Dex Station:USB C to HDMI port also can support Samsung Dex function, which can turn some Samsung mobiles into a desk computer, current include mobile Samsung S8/S8+/Note 8/S9/S9+/Note 9.
  • Nintendo Switch Dock: this Type C adaptor can replace your huge original Nintendo Switch Dock, Enjoy the Switch games in TV mode (Important note: Please use the original Nintendo Switch power adapter when you use this function.)
  • USB "On-the-Go" OTG Functionality: When plugged into a compatible Smartphone, you can use this device to read your thumb drive/USB drive as well as utilize keyboards, mouses and other memory cards

Type C PD Charging:
This device also include the PD charging port, which makes it possible for you to charge laptops or mobile phones while plugged. Note: Especially when you use the Samsung Dex or Nintendo switch function, remember to plug the PD cable in to provide sufficient power to the device.

USB3.0 HUB:
These ports can support high speed data transfer up to 5Gbps, also supports USB keyboards, most mouse, USB flash drive, USB hard disks and phone charging.  It is backward compatible with USB 2.0/1.1. The USB 3.0 Port max output current is 0.9A only, so don't expect it to connect to high power consumption devices, such as external Hard Drive/CD-ROM/DVD-ROM devices. And we don't recommend using the USB 3.0 ports for charging decies as the charging speed will be slow (use PD port instead). 

USB2.0 Card Readers:
These card slots support data transfer via memory cards SD and Micro SD. Note that they cannot read/write simultaneously.

RJ45/Ethernet/LAN Adapter:
Supports 1G high-speed transmission; offers full 10/100/1000 Mbps super fast gigabit Ethernet performance - faster and more reliable than most wireless connections.

Device Compatibility List (partial):
  • Macbook pro 15-inch with USB C/Thunderbolt 3 ports
  • Macbook pro 13-inch with USB C/Thunderbolt 3 ports
  • Macbook 12-inch with USB C port
  • Macbook Pro 16/17/18-inch with USB C /Thunderbolt 3 ports
  • iMac 17"
  • New iPad Pro 2019 and current iPad with USB C port.
  • HP Spectre 13,HP Pavilion X2,Envy 13, EliteBook 745/1050
  • G1/Folio G1, HP 4 Pro
  • Dell XPS 13/15,G3/G5/G7 series, DELL INSPIRON 5000/7000
  • Lenovo Yoga A6 Pro/5 Pro Air12",Yoga 900 13", ThinkPad X1 Carbon 2017
  • HUAWEI MateBook X/Pro/E ,MateBook 14/13, honor MagicBook
  • Xiaomi Air 12.5"/13.3", Xiaomi Pro 15.6"
  • ASUS ZenBook 3/3Pro, U4100, U4100UN,U5100UQ,ROG series
  • RAZER Blade Stealth
  • Microsoft Surface Book 2
  • Google PixelBook
  • Thunderbolt 3 ready computers
  • HUAWEI Mate 10, Mate 10 PRO ,Mate20/20 Pro/20 X,P20/P20
  • Pro, P30,P30 Pro, honor V20,honor Note 10
  • ASUS ROG
  • Samsung S8, S8+, S9, S9+,S10e,S10,S10+,Note 8, Note 9
  • SMARTISAN R1,R1 pro2s
  • HTC 10,Ultra, U Ultra, U11, Bolt
  • Microsoft Lumia 950XL
  • Nexus 5X,6P
  • LG G5
  • OPPO R17 Pro
And many more - this is just a partial list of compatible laptops and smartphones.