The Alesis P3 is a wall-mounted power supply with a 9VAC output and an 830mA current capacity. It is compatible with the following Alesis products: 3630, AI2, AirSynth, Akira, D4, DEQ224, DEQ230, iED04, iDM02, MEQ230, MicroVerb 3, MicroVerb 4, MidiVerb 4, MidiVerb 2, NanoBass, NanoCompressor, NanoPiano, NanoSynth, NanoVerb, ModFX, PerformancePad, PicoVerb, SR16, Trigger IO, and Vocal Zapper.
Note: Compatibility with MidiVerb 2 is subject to the time that MidiVerb 2 was made. Some units use a P2 adapter, not a P3 adapter. Check with manufacturer to confirm compatibility of your specific unit.