Sony PCM-A10 High-Resolution Audio Recorder - Manual (Page 479)

If the Bluetooth connection is unstable, remove any obstacles, such as people or metal objects from between the camera and the
paired smartphone.
The communication distance for the Bluetooth connection or Wi-Fi may vary depending on the conditions of use.
Supported smartphones
Refer to the support page for the latest information.
https://www.sony.net/iem/btg/
For details on Bluetooth versions compatible with your smartphone, check the product website for your smartphone.
Related Topic
Functions available with a smartphone (Imaging Edge Mobile)
Pairing the camera with a smartphone (Smartphone Regist.)
Bluetooth Settings
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