Vivitek RP56HD21-A Remote User Manual page 5

Button Function
Number button pad. Selects a channel or
password.
MUTE. Turns the sound on and off.
100. Enters channel numbers greater than 100
in TV mode.
VOL. Turns volume up or down.
LAST. Recalls the previously viewed channel.
SLEEP. Turns on the sleep timer.
INPUT. Changes the input source.
CH. Changes the channel.