Bose L1 Model 1S Sound System. Unit includes 3 optional add-on components: a second B-1 subwoofer, a ToneMatch mixer, and a R1 remote controller. ToneMatch mixer allows up to 5 instruments or microphones to be connected to the L1 system, with individual controls for each input. R1 controller allows remote control of the overall PA system gain and 3-band EQ shaping. Unit is in good operating condition, with few surface scratches or blemishes, Includes carrying cases for most of the components. Missing bracket to connect ToneMatch controller to the speaker column, but it functions fine without the bracket, as a standalone. Subwoofer measures 14.5"h x 10.5"w x 18"d