This product is very practical for recycling monitors Encountering display failure. Unable to determine whether it is a malfunction of the host or display You can use this tool to determine which fault it is; Simple and practical, it is a good helper for repairing and recycling displays. Applicable objects: high-definition TV, LCD display, CRT color display, projector recycling and maintenance testing This generator is a simple and compact VGA/SVGA/XGA color generator. It is a unique, practical product for testing and adjusting VGA/SVGA/XGA display devices such as monitors, projectors, etc. In the four most common VGA resolution modes - 640x480, 800x600, 1024x768 and 1280x1024. Whenever power is applied, and one of the resolution select buttons is pressed, it outputs a color pattern through the 15 pin D connector. It is powered by a 9V battery(6F22ND). Need to remove the battery if using external AC adapter(7.5~9.0V). This generator does not include AC adapter. Support both CRT and LCD monitors. Outputs: Standard VGA/SXGA/XGA RGBHV signal on an HD15F connector. Resolutions: 640 x 480, 60 Hz. 800 x 600, 60 Hz. 1024 x 768, 60 Hz. 1280 x 1024, 60 Hz. Power source: A 9V Battery.(6F22ND) (NOT included) In turn: Square/Bar/Red/Green/Blue/White/Grey/Black/Flash/Table MODEL- (KHz) (Hz) VGA 640*480 31.5 60 SVGA 800*600 37.9 60 XGA 1024*768 48.4 60 SXGA 1280*1024 64 60 Instructions for use: Simply connect the 15 pin plug of the color display during operation Power on Just select the signal Easy to operate. a standby button to enter standby mode. any other button to turn on and start working The default signal for startup is a color block diagram (1024 * 768 * 60Hz). Two signal selection keys can cycle through signal selection Two resolution selection keys, allowing you to choose from four resolutions: 640 * 480, 800 * 600, 1024 * 768, 1280 * 1024. The refresh rate (frame rate) is fixed at 60Hz. Colour: As Shown Material: Plastic Package Contents: 1 x Detector 1 x Data Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.