The Presys preamp system is designed and built to offer maximum control, performance and quality in a small and discrete format. It has volume, bass, medium and treble controls, a phase switch and a built-in chromatic tuner with LED display. Presys preamps also include a pre-wired Fishman Sonicore electric piezo for a solder-free installation, plug and play, a low battery indicator, low profile control knobs and a unique pivot design for easy access to the Battery compartment. It also has cannon plug output.