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 the DJI GO 4 app. Its folding clamps allow you to attach your mobile device securely. Maximum remote controller battery life is 2.5 hours approximately.*** *The Spark remote controller is currently only compatible with Spark aircraft. **The remote controller can reach its maximum transmission distance (FCC) in a wide open area with no electro-magnetic interference and at an altitude of about 120 meters. ***The maximum working time should be taken for reference only.