A switch located at the left (High-Pass Filter) allows to change the microphone's cutoff frequency. This reduces low frequency interference directly at the input of the microphone amplifier. This setting also compensates for the unavoidable bass boost that occurs with all pressure gradient transducers when they are used at close distance (proximity effect).
The second switch attenuates the sensitivity by 10 dB. This option should be used in high SPL environments or by recording of loud instruments (for example saxophone).