HDMI 4×1 Multi-Viewer Seamless Switcher with Full screen, 1×2, 2×2, and 1+3 PIP - $0

Details:

Multiview controller supports Multi View Seamless Switch allows simultaneously display real-time HDMI video from different input sources on a single monitor in 3×3, 2×2 or full screen modes. The product can be controlled through the front panel button, IR control, or RS-232.
Please visit: https://www.avextender.com/product/hdmi-4x1-multi-viewer-seamless-switcher-with-full-screen-1x2-2x2-and-13-pip/