Remote Controller. Features: 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 1.2km. 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. Operating frequencies: 2.412-2.462 GHz, 5.745-5.825 GHz. Operating temperature range: 0°C to 40°C. Built-in battery: 2970 mAh. Operating voltage: 950 mA, 3.7V. Supported mobile device thickness: 6.5-8.5 mm. Max length: 160 mm. Compatibility: Spark.