Features: CJ01L effectively reduces noise accurately pickups and reproduces every detailed sounds clearly designed for cajon box drum. & tone knobs and phase switch allows easily setting level balance of bass and treble timbre for desired mix sound. The pickup easy to use connects included mic module installed on inside panel of cajon via mic port external amplifier via 1/4 inch jack. Hassle-free installment needs no drilling not damaged to musical instrument finish; just mount it on the soundhole with adhesive pads. Small and lightweight cajon preamp only 3.63oz weight measures 12.5*3*5.8cm in size easy to carry anywhere. Specifications: Brand: DOUBLE Model: CJ01L Main Color: Black & Brown Power Supply: 2 * CR2032 Button Cell Product Weight: 103g / 3.63oz Product Size: 12.5*3*5.8cm / 4.92*1.18*2.28in Package Weight: 170g / 5.99oz Package Size: 14.5*8.5*3.8cm / 5.70*3.34*1.49in Note: Pickup set only other accessories in the pictures are not included. Please read the user manual carefully for more information before usage. Due to manual measurement there may be deviation please in kind prevail. Due to or other reasons the picture and material object may slightly differ. Packing List: 1 * Pickup 1 * Microphone Module 2 * Adhesive Pad 2 * Wire Clip 1 * User Manual