Joy Hero https://www.amazon.de/gp/product/B01MTXYNUP/ https://www.amazon.de/Beamer-Crenova-Projektor-Support-Smartphone/dp/B01FXNTD24
docooler.Ultramini DLP Projector https://www.amazon.de/dp/B01MR60X7T http://www.docooler.com/wireless-networking-268/p-v2711.html
docooler.TOUMEI C800 Mini DLP https://www.amazon.com/Docooler-Projector-120-inch-Rechargeable-Bluetooth/dp/B01N2YJ92H http://www.docooler.com/smart-equipments-accessories-51/p-v2592us.html
Projection Calculator Classic get recommended screen sizes, throw distances, room lighting, screen brightness, seating and projector placement based on your application.
http://www.projectorcentral.com/projection-calculator.cfm
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