The DAU is streaming data using Bluetooth communication protocols. The recommended distance between the DAU and the mobile device is 3-5 meters.
If the DAU is located at a greater distance than 5 meters the BT communication might be lost, leading to loss of data and inability to view the signals in real time. Once you move back into the range, the communication will be automatically restored, and the data will continue streaming. Pay attention that the data on the SD card will be intact for the whole period.