This used Whirlwind HATT4 Battery Powered Amp is in good condition and fully functional, offering reliable, portable audio amplification for professional audio applications. Designed to work with 9V battery power, it features four transformer-isolated outputs with ground lift switches, allowing easy distribution of a single audio source to multiple destinations without hum or interference. The compact, rugged metal housing makes it ideal for stage, studio, or remote broadcast use. Whether you're managing a press conference or splitting signal feeds for recording, the HATT4 delivers clean, dependable performance.