This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
BluetoothDevice.productID read-only property returns the 16-bit Product ID field in the
pnp_id characteristic in the
var productID = instanceOfBluetoothDevice.productID
The 16-bit Product ID field.
The definition of 'productID' in that specification.