Key benefits Long runtime: Built-in rechargeable battery provides up to 10 hours of operation on a single charge, eliminating frequent battery changes during practice, rehearsal, or short gigs. Preserves pickup tone: High input impedance and JFET circuitry prevent loading of piezo elements, maintaining the natural dynamics and clarity of the source. Reliable, consistent amplification: Designed for piezo pickups, it delivers predictable gain and low-frequency response so you get usable, stable signal without extra EQ compensation. Flexible setup: Input performance is not affected by the length of the input lead, allowing placement and cable routing freedom without degrading the signal. Main features and specifications Amplifier type: JFET high-impedance amplifier (preamp). Input impedance: Greater than 10 MΩ, suitable for piezo and other high-impedance transducers. Gain example: With a piezo pickup capacitance of 10 nF, the output gain is approximately 20 dB. Frequency response: Lower frequency limit is 30 Hz. Power: Built-in rechargeable battery, up to 10 hours per charge. How this solves common problems Prevents tone loss: The high input impedance (>10 MΩ) avoids loading down piezo pickups, so you don’t lose low-end or transient detail. Handles long cables: Because the JFET preamp is unaffected by input lead length, you can use longer instrument or contact-mic cables without added coloration or instability. Reduces interruptions: Rechargeable internal power delivers all-day usability for rehearsals and extended sessions without swapping disposable batteries. Typical applications Acoustic instruments with piezo saddles or contact pickups (guitar, mandolin, ukulele) where preserving natural tone and low-frequency response is important. Bowed and plucked instruments (violin, cello) and other high-impedance pickups that require a transparent preamp before mixing or amplification. Contact microphones and small recording/live setups that need stable gain and immunity to cable-length effects. Practical notes Example performance: When paired with a piezo pickup of about 10 nF capacitance, expect roughly 20 dB of amplification and usable low frequencies down to 30 Hz. Use cases benefit most when source devices have high output impedance; the device is optimized to interface with such transducers while maintaining signal integrity. Recharge the internal battery between sessions to ensure the full 10-hour runtime is available. Specifications summary Built-in rechargeable battery: up to 10 hours per charge Amplifier type: JFET high-impedance amplifier Input impedance: >10 MΩ Gain (example): ~20 dB at 10 nF piezo capacitance Lower frequency limit: 30 Hz This preamplifier is suited for musicians and audio technicians who need a compact, high-impedance solution to preserve piezo pickup tone, ensure consistent amplification, and operate reliably on rechargeable power.