Onboard Recording and 32-Bit Float
Each transmitter doubles as a recorder with 8GB of storage, which DJI rates at up to 14 hours of 24-bit audio, so you can record straight to the transmitter as a backup or use it on its own with no receiver at all. It also supports 32-bit float internal recording. The practical meaning is headroom: a normal 24-bit recording has a fixed ceiling, and anything louder is flattened into distortion that cannot be repaired, while 32-bit float captures such a wide range of levels that an unexpected shout can be pulled down in editing and a quiet voice pulled up. Combined with the separate onboard copy, the Mic 2 guards against both of the ways a take is usually lost, a dropped signal and a badly set level. Copy files off the transmitters after each shoot, since backup recordings take up storage quickly. For interviews, ceremonies and events that cannot be repeated, this is the feature that justifies choosing the Mic 2 over simpler clip-on kits.