This is a 10W selectable power supply with 6 output including 3V, 4.5V, 6V, 7.5V, 9V and 12V. It also comes with a range of different tips such as 2.5mm mono, 3.5mm mono, 5.5mm/2.5mm, 2.5mm/2.1mm, 4mm, etc. making it ideal for most applications. You can also change it from center positive to center negative.