This pedal does not work with the Stageman II amps, only the Stageman 50.
NUX NMP-4 is a wireless controller designed for NUX STAGEMAN 50 acoustic guitar amplifier, with it you can access to STAGEMAN's hidden features: loop & drum machine and use it as hands-free on/off switch for on-board Chorus and Reverb effects. Turn both devices on, pair them up, ready for gigging.