Is disarming though voice command safe?

When you use your voice to disarm the alarm the virtual assistant will prompt you to enter your PIN number before it disarms the system. The PIN number is the same one that you use when arming or disarming the Hub.

Additionally, you can choose to receive a notification each time the alarm is armed or disarmed. In the unlikely event somebody obtains your PIN you would still be alerted to its use giving you an opportunity to change the code.