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https://www.projector.com.hk/en/wp-content/uploads/sites/2/2025/01/BENQ-lh856ust-Main.png10001000為前沿的課堂互動鋪路 T/R=0.33超短焦比 雷射光源壽命長達 38,000 小時（Eco 模式） BenQ 獨家資訊圖表/生動模式 PointWrite 互動式解決方案相容性 IP6X防塵密封引擎機構降低維修成本