Most ViewSonic Projectors have a built in HDMI connector as well as A/V connectors, also known as the RCA jacks (Yellow Video input and red/white audio inputs).
It is recommended to use an HDMI cable for better image and audio quality when possible, but RCA cables can also be used to connect a cable/satellite box, set top Box, PC, DVD, Blu-Ray or any device with a compatible source, to a projector.
Projector model(s):
LS820,PX727-4K,PX725HD,PX705HD,PJD7828HDL,PX702HD,PX700HD,PJD7720HD,PLED-W800,LS810,LS830,LS800WU,LS800HD,Pro9800WUL,Pro9530HDL,Pro9520WL,Pro9510L,Pro8800WUL,Pro8530HDL,Pro8520WL,Pro8510L,PG800HD,PG800W,PG800X,PG705WU,PG705HD,PG703W,PG703X,PS750HD,PS750W,PS750X,PS700W,PS700X,LS620X,PJD6552LWS,PJD6352LS,PJD5553LWS,PJD5353LS,PJD5351LS,PG603W,PJD6552LW,PG603X,PJD6352,PA505W,PA503W,PA503X,PA502X,PA503S,PA502S,PA501S,PA500S