A full Bass, Mid, and Treble tone stack allows complete control over the frequency shaping of your tone. Presence control to add or cut sparkle to help cut through the mix or blend better with your chosen amp. Whatever style of 80's guitar tone you prefer, the Eighty 7 can deliver. Built with top quality components and designed with durability and longevity in mind, the Eighty 7 can give as good as it gets. 24 volt internal operation from a standard Boss type 9 volt dc center negative power supply. True Bypass switching.