Based on MXR DISTORTION+,MXR MICRO AMP,DOD 250 OVERDRIVE,DOD YJM308.

One toggle:
1,MXR? DISTORTION+
M104
2,DOD DOD250 Overdrive 
3,DOD YJM308
4,MXR MICRO
one toggle:  two model clipping choose.
SPECIFICATIONS
Input Impedance
1 MΩ
Output Impedance*
25 kΩ
Nominal Input Level -22 dBV
Maximum Output Level -14 dBV
Noise Floor**
-74 dBV
Distortion Gain 10 dB to 45 dB, 1 kHz
Bypass
Hardwire
Current Draw
2.5 mA
Power Supply( not included)
9 volts DC

NOTE : About this switch(MR/250/308) is only a little different :

There are very few differences between the three originals pedals(mxr distorion+,dod250,and JYM308), so only you can find a little difference with a high-powered speaker and adjust the  knob In a particular position.                                          

 Or When playing a sweep, meaning when playing multiple strings of different frequencies at the same time, you can see the difference between these three switch(MR/250/308)).