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