Hi juan...
You do not have Bluetooth on the Dell OptiPlex 755, but you can buy a "Bluetooth Dongle" very cheaply from the internet.
It is a plug and play you insert into the usb port and then you have Bluetooth.
Bud
Go to the following webpage to see a Bluetooth dongle
http://www.amazon.com/s/ref=nb_sb_ss_i_0_16?url=search-alias%3Daps&field-keywords=bluetooth%20dongle&sprefix=bluetooth+dongle%2Caps%2C731&rh=i%3Aaps%2Ck%3Abluetooth%20dongle
Bud
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