Look at the headset chip model method
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1, for the Bluetooth industry practitioners, look at the product's Bluetooth chip model can basically determine the product Bluetooth version.
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For most consumers, the easier and more accurate way is to go to the official website of the Bluetooth Association.
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2, this model can be seen on the outer packaging, if there is no outer packaging, you need to open the Bluetooth headset, and then open the Bluetooth function of the mobile phone to connect the Bluetooth headset, you can view the model of the Bluetooth headset in the mobile phone, and then search online you can know the detailed information parameters.
Take apart the screen print on the chip.