HDMI Splitter 1 in 2 Out, 4K HDMI Splitter for Dual Monitors Duplicate/Mirror Only, 1x2 HDMI Splitter 1 to 2 Amplifier for Full HD 1080P 3D with HDMI Cable (1 Source onto 2 Displays) - Newegg.com
Amazon.com: 1080P HDMI Male to Dual HDMI Female 1 to 2 Way Splitter Cable Adapter Converter for HDTV Branded Master Cables : Electronics
What kind of cable looks like HDMI but has only one slanted edge? - Super User
Amazon.com: HDMI Splitter 4K, 1x2 HDMI Display Duplicate/Mirror, WARRKY HDMI Splitter 1 in 2 Out [Metal Shell, 3.3 Ft Braided HDMI Cable, LED Indicators], USB-C Powered Splitter, 1 Source to 2 Identical
A Guide to HDMI Cables and the Different Types
6ft (1.8m) High Speed HDMI® Cable with Ethernet - 4K 60Hz (2-Pack) | HDMI Cables | HDMI | Audio Video
Amazon.com: HDMI Splitter Adapter Cable HDMI Male to Dual HDMI Female 1 to 2 Way, Support Two TVs at The Same Time, Signal One in, Two Out : Electronics
HDMI Splitter Adapter Cable - HDMI Splitter 1 in 2 Out HDMI Male to Dual HDMI Female 1 to 2 Way for HDMI HD, LED, LCD, TV, Support Two The Same TVs at The Same Time 1080P : Electronics - Amazon.com