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User manual Optoma HD20 (English - 50 pages)
Amazon.com: Optoma HD28HDR 1080p Home Theater Projector for Gaming and Movies | Support for 4K Input | HDR Compatible | 120Hz refresh rate | Enhanced Gaming Mode, 8.4ms Response Time | High-Bright
Optoma HD73 720p DLP Home Theater Projector User Manual - Manuals+