Curtis PSB374W - Manual (Page 4)

Remote Control Description
ST-BY： Standby switch button
INPUT： Input signal select button。AUX1→AUX2→BT to toggle through choices
MUTE： Mute Switch Button
SUB-/SUB+: Subwoofer volume control buttons
VOL-/VOL+: Sound bar volume control buttons
TREBLE-/TREBLE+: Treble volume control buttons
Pair Press Pair then the sound bar pair light works to connect with subwoofer.
News： Sound effect for TV/NEWS
MOVIE/MUSIC: MOVIE/MUSIC Sound Mode options
Subwoofer back side :