Kramer Electronics VP-31 is a professional 3×1 VGA/XGA switcher

The Kramer VP-31 is a professional 3×1 VGA/XGA switcher. It lets you connect three computer graphics sources (PCs, laptops, scalers) and switch them to one display output. In simple terms: 3 PCs → 1 monitor (selectable input) It’s part of Kramer’s “VP” line, designed for high-resolution analog RGBHV signals used in offices, studios, classrooms, and control rooms. Specifications Type: VGA / XGA / RGBHV switcher Inputs: 3 × VGA (HD15) Output: 1 × VGA (HD15) Switching: Manual front-panel selection (button A / B / C) Bandwidth: ~450 MHz (very high for analog VGA) Resolution support: VGA → UXGA and higher (transparent analog pass-through) Signal type: RGBHV / RGBS compatible Coupling: Direct (no scaling, no conversion) Connectors: HD15 (standard VGA) Power: AC mains (internal PSU) Format: Desktop or rackmount (with ears)