Feature: 1. Bluetooth function can flexible connect to peripheral devices, and you can also download various audio to play with the guitar. 2. Supports high-fidelity recording and instant playback functions, connect to the mobile phone and you can save or delete the recorded audio files, and play the recorded sound guitar resonator or speaker. 3. Through changing he audio frequency of pickup channel, the preamp can suppress the resonant horn whistling, and simplify the installation and debugging on various guitars. 4. The charging port on pre-amplifier panel allows for convenient and quick charging. 5. Two 18650 rechargeable batteries have a super long battery life, thus the resonant mode can be used continuously for more than 10 hours after being fully charged, and stage mode can last for more than 30 hours. 6. The high-fidelity audio digital DSP module inside is able to achieve the expansion of reverb, chorus, delay and other sound effects and have a more beautiful and flexible sound. 7. The flat-panel speaker attached can vibrate the guitar cabinet to produce DSP sound effects and increase the resonance volume. The guitar cabinet can also work as a small speaker through Bluetooth connection. 8. Built-in independent omnidirectional microphone finger-flicking board enables low and high two-stage timbre adjustment. Low, middle, and high three-stage timbre adjustment will meet different timbre needs. Specification: Item Type: Guitar Preamp Pickup Material: Metal + Electronic Components Colour: Black Battery Type: 2 x 18650 Rechargeable Lithium Ion Battery (delivered without battery). Package List: 1 x Guitar Preamp Pickup1 x Pickup Stick5 x Knob1 x Resonance Horn1 x Hole Sticker1 x Guitar Preamp Pickup Function Panel 1 x USB Cable1 x Output Cable1 x Mini Cross Screwdriver3 x Socket Nut2 x Cable Clip2 x Drill Bit1 x Double-Sided Sticker1 x User Manual