Spark's remote controller features a brand new Wi-Fi signal transmission system, capable of controlling the aircraft and gimbal camera at a maximum transmission range of 1.2 mi (2 km). The remote controller can connect to a mobile device wirelessly and display a live video feed via DJI GO 4. Its folding clamps allow you to attach your mobile device securely. Maximum remote controller battery life is approximately 2.5 hours. The Spark remote controller is currently only compatible with Spark aircraft. The remote controller can only reach its maximum transmission distance (FCC) in wide open areas with no electromagnetic interference and at an altitude of around 120 meters. Maximum operation time should be taken for reference only.