Features: Acoustic guitar sound hole pickup for 36-42 inch classic guitars & folk guitars. Dual pickup modes(pickup stick & Mic), and the volume of Mic can be adjusted. With TONE & VOLUME adjusting knobs, supports PHASE function. Easy and quick installation, just hitch the pickup to rim of guitar sound hole, no need to cut holes on your guitar. Exquisite metal & plastic shell design, high-quality circuit board with shielded layer, low noise and strong anti-interference. Specifications: Type: Include Battery / Not Include Battery (Optional) Fits for: 36-42 inch acoustic guitar Power Supply: 2 * CR2032 Batteries(NOT Included) Item Size: 8.3 * 6 * 3cm/ 3.3 * 2.4 * 1.2in Item Weight: 58g/ 2oz Package Size: 13.5 * 12 * 4.5cm/ 5.3 * 4.7 * 1.8in Package Weight: 175g/ 6.2oz Note: Battery is not included. Package List: 1 * Pickup 1 * Pickup Stick 1 * Endpin Jack 1 * Cable Clip 4 * CR2032 Batteries(Optional)