Press and hold weather button to turn alerts on / off.
Press the menu / ok button (top right hand knob) to go through menu options, and push in again to select.
Press and hold ANL/NB (automatic noise limiter / noise blanker) for one second to turn on off key beep (this only works on models made after 2015; if you have a pre-2015 model you will have to open up the unit and edit the circuit board).