The VGAPATTERN VGA portable video signal generator lets you quickly test VGA-capable displays, making it easier to diagnose & troubleshoot video calibration issues. The device can be powered by either the included AC adapter or a 9 V battery, offering a conveniently portable solution for mobile installers & technicians. The video signal generator features 8 built-in video test patterns, including both HD video test patterns & standard definition patterns, allowing you to quickly analyze color performance & linearity issues. Delivering a cost-effective way to test a VGA display, this portable video signal generator is an ideal solution for AV install experts/integrators or digital signage installers looking to save time & solve problems with a VGA display.