Features 1. A high-end, upgradable, clear and transparent passive three piece piezoelectric pickup designed specifically for acoustic guitars. 2. High output German piezoelectric components are used without the need for batteries. Comes with installation guide. 3. Standard 1/4 inch (6.3mm) mono output jack. 4. Three balanced German made ceramic piezoelectric elements - with a diameter of 20 millimeters. 2.5mm mono input jack (from piezoelectric component). No battery required Specification ; Material: Copper, Rubber, Plastic Packaging size: 20 * 10 * 3 cm Cable length from piezoelectric element to microphone jack: 22 centimeters Frequency response range: 22Hz-18kHz The frequency range of guitar EADGBE corresponds to e2 (82Hz) to F6 (1397Hz) Impedance below 1M Ω Package Include: ; 1* ; 3-piezo Pickup ;