LEGO Functions Power Functions IR RX 8884 IR Reciver has 2 outputs that connect up to 2 different LEGO Power Functions The LEGO Power Functions IR RC system operates on 4 different channels enabling you to control 4 different models at the same time. Use 8885 IR Remote Control or 8879 IR Speed Remote control to control functions on the IR Receiver The reaching distance of the infra-red RC system is at least 30' (10m) Requires battery box (Item #8881), not included 1 piece