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