Features:3.Equalizer piezo pickup suitable for acoustic folk classical guitar.4.Should be used with 9V battery, do not including.5.With ultra-thin silver pickup,easy to install,conveniently to use.6.Will not influence the sound,can improve the coupling between the transducer and the guitar.Note:1. The sound of this product is crisp and bright High-pitched, and bass performances are obvious.Can greatly enhance the performance of music lovers 2.Our pickups are tested by professionals before being shipped out(to solve your worries).Please test according to the instructions.The sound produced may be different from the sound expecting in your mind due to improper use.Specifications:Material: Plastic and MetalColor:BlackBrand name: BQLZRPreamp pickup Size:80x67x13mm/3.15x2.6x0.51inch(LxWxH)Cable Length:5.5cm/2.17 InchModel: A-TURWeight: 136 gInstructions:MIC: Microphone volume control,which controls the volume of the microphone according to personal preference.PHASE: The speaker may produce a whistle while playing.You can adjust the direction of the speaker's sound to solve.VOI: Used to adjust the total volume of the guitar.BATT: Battery button (to confirm whether the battery has power)OUT: speaker output cableMIC: microphonePZ: pickup strip jackBATT: tail pin connection socketPackage include:1x Preamp pickup system1x 9V Battery bag3x Switch glues2x Connection Cable1x Pickup Cable