Each Fishman Fluence pickup has two distinct and useful sounds on-board. These sounds start with the revolutionary Fluence Core, the heart of Fluence tone. From this Fluence Core we then create the classic timbres and tone -; colors you expect from great guitar pickups -; as well as some you've never expected. Active electronics deliver classic tone - without the noise We all love the sound of vintage pickups. That being said, buzz and inductance issues leave a bit to be desired. With Fishman Fluence Classic Humbucker pickups, you can run hundreds of feet of guitar cable without any quality loss. Your volume control will operate with unprecedented smoothness, allowing you to milk useful sounds out of your guitar, even at low settings. To call these pickups "noiseless" would be a grand understatement! Multi-voice Fluence Classic provides two distinct voices The Fluence Classic provides you with the choice of two unique, selectable voices. The Fluence Classic Humbucker pickup's first voice is reminiscent of a vintage PAF pickup. Plug into your amp and treat yourself to that familiar sweet warmth, accented by clear and present articulation. The second voice invokes a hot-rodded humbucker, with its muscular, beefy, overwound tone. Don't worry, both voices deliver the unmistakable humbucker sound! The voices can be accessed by any number of standard switches or push/pull controls and can be added as a completely reversible modification to most guitars. Power supply delivers 200 hours of use Offering 200 hours of playing time, Fishman Fluence pickups also fully recharge in a matter of a few hours by using a standard USB charger. These pickups utilize either a standard 9V battery, or you can use the optional Fluence battery pack. These battery packs screw onto your guitar in place of the control or spring cover, requiring no modifications to your instrument.