One of the main advantages on APEX and VERTIX models when compared with other watches is the digital knob. With the digital knob, you can easily operate the watch with a single turn or click of the knob by using only one finger. Even if you are in the middle of a workout or wearing thick gloves in subzero environment, digital knob is the ideal solution for operating your watch.
COROS has conducted rigorous tests to ensure the durability of the digital knob even in the toughest environments and user cases. For instance, the digital knob on VERTIX is built to withstand a 25 foot / 8 meter drop.
If you still need help, please contact COROS support.