The BLACKSTAR FLY-PSU is a dedicated power supply unit designed for use with the Fly 3 amplifier. Providing reliable and stable power, this PSU ensures consistent performance of your amplifier, eliminating the need for batteries and offering a convenient power solution for practice sessions, rehearsals, and performances. With its compact design and versatile compatibility, the FLY-PSU is an essential accessory for powering your Fly 3 amplifier wherever you go.