The PL3 & PL4 are impossible to tell the difference. The Android App is newer and I asked for the app to display ProLaser 3 or 4 because on previous versions if you were with with a PL4 it would just say PL3 so now it will show that its a PL3 or PL4. I would not worry about the BT serial number. Its not like the CPU Serial number it cant be used for anything and I would not worry about it in any videos. Many of my past videos have my BT Serial number shown. JUst be caution if you go into the "System Info" screen because that will show your CPU Serial number.







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