1、Built In High Sensitivity Tuner: The guitar preamplifier features a phase effect inversion function and a highly sensitive tuner for accurate tuning capabilities. 2、Simple and Compact Design: The for Presys Plus onboard preamp system is designed to provide optimal control, performance, and quality in a discreet and compact form. 3、Accurate Sound Control: The compact system includes volume, bass, mid, and treble controls, a phase switch, and a built in tuner with an LED display screen for easy tuning. 4、Convenient Installation: The guitar preamp also includes a pre wired for Sonicore pickup for no solder, plug and play installation, along with low battery indicator light, and a unique pivot design for easy access to the battery compartment. 5、Enhanced Sound Quality: The for Presys Plus preamp system is designed to deliver enhanced sound quality, ensuring clear, balanced, and dynamic tones that bring out the best in your guitar performance.