The projector is most likely positioned too close or too far from the screen. 1. Adjust the distance between the projector and the screen. The device is not exorbitantly priced but delivers everything that you need in a home theater projector. DBPOWER L21 LCD Video Projector. 3.DBPOWER L21 Projector. The DBPOWER L21 costs virtually nothing. Please read the user manual carefully before using the projector. Narrow by model, sku, video inputs and Video Projector Display Technology. The ideal operating distance is between 1 m (3.28 ft) and 5 m (16.4 ft). It is great for home theatre experience as it works well in a dark room but it is not well- recommended for business presentation, excel, PowerPoint and more. Distinguish which DBPOWER mini projectors is best for you. Ultra-Big Screen & Full HD 720P Native - The DBPOWER L21 full HD 1280*720P native and highest resolution 1920*1080p mini projector offers an ultra-big screen size from 40” to 200” at a projection distance of 1m-5m. If you want to enjoy better images, the DBPOWER L21 LCD Video Projector will deliver that wherever you go. We made a comparison of nine finest 2020 DBPOWER mini projectors over the previous 2 years. Speaker System, user manuals, operating guides & specifications First things first, the projector's native resolution stands at 1280 x 720p, which is what defines HD. The computer and projector don't seem to communicate via USB. The DBPower T20 weighs in at 2.1 pounds, and measures 12 x 8 x 4.5 making it a “mini” size projector. Please use a standard power cord with ground wire to ensure stable power supply. Get it now on Amazon.com. First of all, many people are impressed by the image quality. DBPOWER L21 Video Projector, Upgraded 6000L 1080P Supported Full HD Mini Movie Projector with HDMIx2/USBx2, Compatible with Smart phone/PC/TV/PS4/DVD $129.89 @ Amazon.com Product Description I'm trying to connect it via the USB port. To connect the DBPOWER mini projector with a tablet or smartphone, it is necessary to use a wireless HDMI adapter. [REMARKABLE BRIGHTNESS AND CLARITY]: DBPOWER L21 mini LCD video projector, upgraded bright to 180ANSI-5000Lux, 3000:1 contrast ratio, 1280x720p native resolution, supporting 1920x1080p highest resolution makes it brighter than other comparable Mini projectors on the market. It is brighter than most of the projector because of its high-resolution support 1920x1080p. DBPOWER L21 LCD Video Projector, 4200L 1080P 1920x1080 Supported Full HD Mini Movie Projector with HDMIx2/USB/SD/AV Ports, View & download of more than 11 DBPOWER PDF user manuals, service manuals, operating guides. However, keep in mind that it only costs about $100. I have a new DBPower projector. It features an incredible balance in brightness, contrast ratio, native resolution, and screen size. 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