How far away can I be from my BT110 device and still have Alexa interactions with the BT110 device?

There is no definitive answer to this question as it depends on many factors such as the noise level of the environment, the loudness of your voice, the angle between the voice source and the BT110 microphones, and whether there are objects blocking the direct path between the voice source and the BT110 device, etc.  In general, the BT110 device may still be able to pick up your Alexa commands for a distance up to 4 meters.