Morley power adapters are regulated; other brand adapters are not regulated, and will cause your Morley pedal to hum. Morley uses regulated adapters to minimize the circuitry in their effects pedals. This maintains guitar tone and level and also prolongs battery life. Morley power adapters are also compatible with most other effects pedal brands.
Morley power adapters are 9VDC 300mA Positive Out (center polarity is negative). A built-in LED indicator shows that power is on and adapter is working.