how to get access the values of object which are starting from # in laravel php?

I used this "mobiledetect/mobiledetectlib": "^2.8" pkg of laravel for device detection and want to print the userAgent value.I call this method

$this->device = new MobileDetect();
dd($this->device)

After that i got this result:

now i want to print userAgent value. I have tried these code but not working.

dd($this->device->userAgent,$this->device["userAgent"]);

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