DJI Remote Controller for Focus Wireless Follow Focus System Compatibility: Focus Wireless Follow Focus System Frequency: 2.415 to 2.473GHz Range: 100m / 328.08' Transmit Power: 14dBm Battery: FB01-554461 Lithium-polymer (LiPo) Capacity: 1700mAh / 6.29Wh Voltage: 3.7V