The DJI Smart Controller Enterprise for the Matrice 300 series uses OcuSync 2.0 for reliable transmission upto 15kms and supports triple channel 1080p video. The controller features a built-in tablet with a 1080p, 5.5" high brightness screen for superior outdoor visibility. The remote controller is powered by a twin battery system which includes a 5000mAh internal battery as well as the DJI WB37 battery to provide upto 4.5 hours of continuous operation. Operating Frequency 2.4000-2.4835 GHz 5.725-5.850 GHz Max Transmitting Distance (unobstructed, free of interference) NCC/FCC: 15 km CE/MIC: 8 km SRRC: 8 km EIRP 2.4000-2.4835 GHz: 29.5 dBm (FCC) 18.5dBm (CE) 18.5 dBm (SRRC); 18.5dBm (MIC) 5.725-5.850 GHz: 28.5 dBm (FCC); 12.5dBm (CE) 20.5 dBm (SRRC) External battery Name: WB37 Intelligent Battery Capacity: 4920 mAh Voltage: 7.6V Type: LiPo Energy: 37.39Wh Charging time (using BS60 Intelligent Battery Station): 70 minutes (15°C to 45°C); 130 minutes (0°C to 15°C) Built-in battery Type: 18650 lithium ion battery (5000 mAh @ 7.2 V) Charging: Use a USB charger with specification of 12V / 2A Rated power: 17 W Charging time: 2 hours and 15 minutes (Using a USB charger with specification of 12V / 2A) Battery Life Built-in battery: Approx. 2.5h Built-in battery+External battery: Approx. 4.5h USB Power Supply 5 V / 1.5 A Operating Temperature -20°C to 40°C (-4 °F to 104 °F)