Optoma S331 Projector Specifications. 4:3 (SVGA). The Optoma DS331 includes an extensive list of advanced features, including 2x HDMI v1.4a ports with full 3D compatibility, USB type-A with 5V DC 1A power, mini USB-B for remote mouse convenience, built-in 2-Watt speaker & RS-232 connectivity.
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