Rhys 01: Your image shows the collective mounted switch array (all two of them lol) but .. with what is normally the landing light toggle in the place of the rotor RPM governor trim 'Beep switch'.
As RV stated, the 'standard' 'Beep' switch has a "curved serrated knob" as per the images below:
Hughes 500 collective-mounted switches
The flat-sided rectangular toggle (on the right) was the 'standard' Hughes switch for the landing light
And on the left, RV's 'serrated knob' RPM governor Beep switch
Worth mentioning that there are numerous 'home made' modifications, a common one being a 206-style landing light switch instead of the rectangular-shaped one.
Also, some 500's (especially those with role equipment fitted - typically military and public service aircraft) have additional collective mounted switches as per below:
Some 500's have additional collective mounted switches for special role equipment and or additional instrumentation