Can I set the AroMini BT to start scenting from my car or work?

It depends on how close your car or location is to the unit when you're sitting in it. The AroMini BT uses bluetooth technology which connects from your phone's application. Bluetooth has a range of approximately 100 meters (which reduces the larger the barriers between you and the device is). You will have to be relatively near the unit in order to control it with Bluetooth.