With the Fishman Presys+ pickup system in your guitar, you'll have amazing plugged-in tone plus exceptional tone shaping. There are bass, mid, and treble tone controls so you can dial in your ideal sound. A notch filter helps eliminate the possibility of feedback while playing live, a brilliance control helps you cut through the mix, and the phase control helps solve phase problems when recording the Presys+ and a microphone at the same time. And to make sure you're always ready to play your best, there's a built-in tuner on the Fishman Presys+ pickup system. Fishman Presys+ Pickup System Features: Small footprint fits many guitars Volume control Bass, Middle and Treble control knobs Built-in tuner with LED display Phase switch Low battery indicator Unique pivot design for instant 9-Volt battery access Pre-wired Fishman Sonicore pickup for easy, solder-free installation Low profile control knobs Onboard anti-feedback control (Notch) Brilliance control for