Powering a Nano with an ESC

Hi, I am building a plane using an Arduino Nano and a brushless motor. I would like to power the Nano with the BEC wire from the electronic speed controller. However, it does not specify what the voltage is, so I am unsure whether I can connect it to the 5V pin or the Vin pin on the Arduino. The ESC is rated for 10A, the BEC is 3A, and the battery is 11.1V if this information helps. Thanks for any input!

Do you have a link to the specs for the ESC?
I suspect that it is 5v but you should confirm.

This is the link: