All-In-One Storage. Two transmitters and the receiver are pre-linked, charged, and securely stored in the charging case. Noise cancelation 250m (820 ft.) Range - With a max transmission range of 250 meters (820 feet) in open, unobstructed environments, DJI Mic is ideal for scenarios like livestreaming, vlogging, and outdoor recording. 15-Hour Battery - Enjoy 5.5 hours of battery life from the transmitters, 5 hours from the receiver, and up to 15 hours with the charging case.