If you have one source, and want to send that source's signal to multiple TVs, you need an HDMI splitter. Maybe that TV is in a different room, or maybe in the same room you have a TV to watch during the day and a projector to watch at night. A splitter will duplicate a signal and send it out through multiple HDMI cables.
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TESmart Ultra HD 4K@30Hz 1x2 HDMI Splitter HDMI Splitter Box Hub Support 4Kx2K@30Hz 1080P 3D 2160P for DVD Player TV Box
SKU: HSP0102B50
Sale price$15.99
Regular price$18.59
TESmart HDMI Splitter 1 In 2/4 Out Support 4K 60Hz HDR 10 HDCP 2.2 Smart EDID for PS4 Xbox Sky Box Fire Stick, DVD Player HDTV Projector-Coral
SKU: HSP0102A1U
Sale priceFrom $49.99
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TESmart 4K HDMI Splitter 1x8 Ultra HD 4K 60hz 4:4:4 Powered 1 in 8 Out HDMI Splitter Compatible with PC PS3 Xbox-HDMI, HDCP 2.2, HDR, RGB, YUV, 18 Gbps
SKU: HSP0108A1U
Sale price$119.90
Regular price$139.99