Portable signal generator with USB cable included Compatibility and purpose Designed to work with display devices such as HDTVs, LCD monitors, and CRT projectors. A practical tool for diagnosing and verifying display signals and compatibility. Four resolution modes Supports 640x480, 800x600, 1024x768, and 1280x1024. Each mode is suitable for testing common display configurations and ensuring correct timing and alignment across devices. Flexible power options Each mode can be powered by a 9V battery or an external AC adapter, providing flexibility for field use or bench testing. Easy to operate Connect the generator to your display using the 15pin connector and select the desired resolution. The default color block diagram appears at startup for immediate testing and quick validation. Portability and build Compact and lightweight with dimensions of 26 mm x 52 mm x 90 mm, making it easy to transport and store for technicians or home users who need fast diagnostics. Practical use scenarios 1) Onsite display troubleshooting: quickly verify signal output when diagnosing issues with HDTVs, LCD monitors, or CRT projectors at a client site. 2) Setup and calibration: use during installation to confirm correct resolution and signal timing before finalizing a display setup. 3) Service and testing: convenient test tool in shops or service desks to evaluate or replacement displays before deployment.