Product Description: Piezo Pickup Preamp Amplifier for String Instruments Wide Compatibility: This piezo pickup preamplifier is designed for a variety of stringed instruments, including guitars, cellos, violins, ukuleles, and mandolins. It is suitable for surface-mounted piezo pickups and comes with a 6.35mm sound cable, making it versatile and easy to integrate into your setup. High Impedance Circuit: The preamp features a JFET high impedance charge type amplifier circuit with a built-in piezoelectric ceramic chip. This design ensures that the preamp is not affected by the length of the input cable, eliminating any friction effect and maintaining sound quality. Gain Function: With a capacitance value of 10nf, the piezo pickup provides approximately 20db of gain. It has a lower frequency limit of 30Hz, an input impedance of more than 10MΩ, and an output impedance of 600Ω, ensuring clear and powerful sound reproduction across a wide frequency range. Rechargeable Battery: Equipped with a built-in 300mAh rechargeable lithium-ion battery, this preamp offers up to 10 hours of continuous use on a single charge. It includes a Type C charging cable for convenient recharging, ensuring you have power when you need it. Aluminum Alloy Design: Crafted from premium aluminum alloy, this piezo pickup amplifier is both durable and portable. Its robust yet compact design makes it an ideal companion for musicians on the go, providing reliable performance in a lightweight package. Enhance your musical performance with this high-quality piezo pickup preamp, designed to deliver exceptional sound clarity and reliability for all your string instruments. Whether you're performing on stage or practicing at home, this preamp ensures your sound is always at its best.