Sony AIRSA10 S-AIR Speaker System - Black (Discontinued by Manufacturer) 1-line LCD display Clock/Timer/Sleep function Expandable up to 4 S-AIR receiver/speakers systems S -AIR wireless multi-room receiver/speaker system 8 Watts (RMS) (4W x 2) S -AIR wireless multi-room receiver/speaker system Expandable up to 4 S-AIR receiver/speakers systems 8 Watts (RMS) (4W x 2) Clock/Timer/Sleep function 1-line LCD display