Acer P1373WB - Manual (Page 54)

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ish Wireless Display (optional)
Adjust projector source to LAN/WiFi, choose "Wireless Display", you can enjoy
mirroring projection from your smartphone to the projector (Android V4.2 and
above).
NOTE: To utilize the Wireless Display function (optional), make
sure you have updated the firmware to the latest version from
www.acer.com, and use the acer USB WiFi adapter, UWA2.