9V 200ma, 2.1mm x 5.5 Barrel Connector. UL Listed and made to last! Each kit comes with a total of 50 power supplies! These power supplies are great for anyone in the music industry. Whether you're looking for a new power supply for your keyboard, guitar multi effect pedals, or amplifiers. If you experience any issues with your order or the connectors you receive, reach out to our customer service team for help! With a 30-day money back guarantee and free support from our team, you've got nothing to lose. Start your next project by purchasing the power supply available on Amazon!