How to set up the two different modes and levels. Is it easy to use?

Yes, it is easy to use, as our no-bark collar has an LED digital display that shows each level by a number. So, you could easily set it by button – it is a circle set up. Number 1 is the weakest, and 9 is the strongest. It has two modes. If you do not want to use the shock mode, then you can use the beep+vibration, which is indicated by the green LED light. The second mode is beep+vibration+shock; to activate, press button set/pow and this will be indicated by the red LED light.