The Obstacle Level Button is located on the side surface of the Cane, between the Voice Level Button and the USB-C Charge Socket. When the Cane is held perpendicular to the ground, it is the upper one of the buttons on the right surface of the Handle. The shape of the button is round. This button allows you to loop between obstacle detection options when you click one time: Turn Off, Low Range, Mid Range, High Range, Turn Off, Low Range, Mid Range… 

This button also allows you to turn on and off the flashlight with a long press.