Features: High Quality: the pickup with a piezo pickup stick can connect external amplifier via the cable that has 1/4 inch jack, provide subtle and clear sounds. Easy to Use: it is easy to control volume, bass, treble and phase via key and knobs, to acquire wanted mixed voice; and a light indicates battery status. Hassle-free to Install: just a few simple steps can install the sound control module on the edge of soundhole with included adhesive pads. Long-endurance: power supply of 2 CR2032 button cell ensures it continuously works for nearly 80 hours; and it is convenient to replace batteries. Lightweight & Portable: small guitar pickup, measures 8*6*3cm in size and about 2.50oz in weight, suitable for acoustic guitar. Specifications: Brand: DOUBLE Model: B1G Material: Plastic + Electronic Components Main Color: Black Power Supply: 2 * CR2032 Button Cell Product Weight: 71g / 2.50oz Product Size: 8*6*3cm / 3.14*2.36*1.18in Package Weight: 160g / 5.64oz 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 lighting or other reasons, the picture and material object may slightly differ. Packing List: 1 * Pickup 1 * Cable with 1/4 inch Jack 1 * Pickup Stick 2 * Adhesive Pad 2 * Wire Clip 1 * User Manual