Sony ECM-680S M/S Stereo Shotgun Microphone - Manual (Page 17)

Functions may become restricted (e.g., the continuous operating time when streaming video over an HDMI/USB connection may
become shortened) in high-temperature environments even when the Endurance mode is turned on. It is recommended that you
use an external cooling fan when you use your device for a long time in a high-temperature environment. When using a cooling
fan, check the positions of the recording microphones and place the cooling fan in a location where they will not pick up fan
noise.
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