For best connectivity, your phone or tablet should be in a direct range of your device (about 10 m or 32 ft).
Also, Bluetooth radio waves can be blocked by your body. Therefore, we suggest that you place the Hexoskin Device horizontally into the shirt pocket with the wire upward and the light outward to protect the shirt connector and to allow better data Bluetooth data transmission.
Also, keep in mind that some buildings and/or installations can cause Bluetooth interference.