The Video Switching & Wall Control app by StarTech.com is a free utility tool for Android users that allows remote control of their ST12MHDLAN HDMI® Over IP Extenders through a phone or tablet. The app's primary function is to switch video sources and create and control a video wall.

With a user-friendly interface, this app makes it easy to switch between video sources and create custom video walls to suit your needs. The app allows for easy control of the video wall layout, including the ability to add or remove screens and adjust the size of each screen.

Overall, the Video Switching & Wall Control app is a useful tool for those looking to remotely control their ST12MHDLAN HDMI® Over IP Extenders. Its simple interface and easy-to-use features make it a must-have for anyone using this technology.