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DIY solution: https://learn.adafruit.com/diy-bluetooth-gamepad/overview
Presenter options: https://www.amazon.de/Doosl%C2%AEPowerpoint-Fernbedienung-Funktioniert-Wiederaufladbare-OpenOffice-Schwarz-011/dp/B01M3PXRL4/ref=sr_1_7?s=officeproduct&ie=UTF8&qid=1521733456&sr=1-7&keywords=presenter+Linux