1Anti-howling Circuit: by changing the audio frequency of the guitar pickup channel, suppress the howling of the resonant horn, so as to adapt to the installation and debugging of various types of guitars. 2USB Charging Interface: the charging interface on the pickup panel is convenient, simple and universal. 3Battery Capacity: built-in a removable and rechargeable lithium battery, full of electric resonance mode can be used continuously for more than 8 hours, stage mode can last more than 20 hours. 4Audio Digital DSP Effect: built-in high-speed high-fidelity audio digital DSP module, configuring high-quality circuit to realize reverberation, the extension of sound effects such as chorus and delay, making the sound more flexible, transparent, broad and beautiful. 5Guitar Resonance Function: using the flat speakers attached to the inside of the guitar to make the guitar cabinet vibrate and sound, realizing DSP sound effects, and increasing the resonance volume of the piano cabinet.