sure it says 9 volts.. but the voltage can fluctuate and defluctuate alot. measured my friend's generic brand adapter, one moment it read 8.4volts and the next it read 9.8volts. don't rely on these generic brands. you pay $100+ for your precious pedal, then still cnt fork out $35-$50 more or a good adapter? don't be too cheap k :wink: