Product Functional Characteristics EXCELLENT CRAFTSMANSHIP: Adopting exquisite manufacturing process to ensure the quality and reliability of the product, it is a high quality guitar accessory. Phase inversion converter: Equipped with a phase inversion converter, it can change the phase of the signal, solve the sound interference or unsatisfactory tone caused by phase problems, and improve the purity and clarity of the sound. Automatic Low Battery Check LED Indicator: Equipped with an automatic low battery check function, the LED indicator will light up when the battery is low, reminding the user to replace the battery in time to avoid affecting the performance due to low battery. Three-band equalization and tuner mode: Provides three-band equalization (Bass, Middle, Treble) and tuner function, which allows users to make fine adjustments to the frequency of the guitar's sound according to their own playing styles and musical needs, while the built-in tuner can quickly and accurately display the guitar's pitch, helping users to tune the guitar to ensure that it is in tune when playing. Size and installation dimensions: the product size is 70mm x 48mm. Set Contents 1 x Acoustic Guitar 3-Band Equalizer