- Gonine 9V 500mA power adapter with negative tip, designed for guitar effect pedals and musical devices that require this specification. - Compatible with BOSS pedals, Danelectro mini amplifiers, and 9V 0.5A negative tip keyboards. - Not suitable for devices that require a positive tip or an amperage higher than 500mA. - Features an anti-hum magnetic ring to eliminate noise and maintain sound quality. - International certifications CE, RoHS, FCC, and CCC, with multiple protection against overvoltage, overheating, overcurrent, overpressure, and short circuit. - Standard 5.5 mm x 2.1 mm connector, easy to install and compatible with most effect pedals and musical equipment.