distributes music from up to four sources to as many as four listening areas in your home * system includes: one CAS44 controller/amplifier, four CAS44 KPL keyapds, and one CAS44 universal remote * expandable with additional components and keypads * 4 RCA stereo inputs for connecting source components * 2 IR outputs (2 dual infrared emitters included) * mute trigger allows you to connect an external paging system or doorbell * universal learning remote operates connected audio components through IR sensor on system keypads * 16-15/16″W x 3-15/16″H x 12-15/16″D * warranty: 2 years *