The €Lab interface is only powered through USB, which places a limitation to the maximum power consumption. This may also be dependent on the computer the interface is connected to. Some sensors needs more power (for example the Force sensor or the CO2 sensor) and when such a sensor is connected to €Lab and the USB port does not provide enough power then the sensor may not work properly or may not be automatically recognised by the Coach software. First select manually the sensor from the Coach Sensor Library and check if this solves the problem.