This has been designed for use with the EV3 Infrared Seeker Sensor. The beacon emits an infrared signal which the sensor can track. The beacon can also be used as a remote control for the EV3 brick through signals sent to the infrared sensor.• Requires two AAA batteries• Four individual channels• Includes a beacon button and toggle switch to activate/deactivate• Green LED indicating if the beacon is active• Auto power-down if the unit is not in action for one hour• Working distance of up to two meters