Suitable for surfaces mounted Piezo Pickup<br> This machine is a JFET high impedance type amplifiers circuit, which is not affected by the length of the input line and have no frictions effect<br> The builts-in lithium battery is rechargeable and can last for 10 hours on a single<br> Gains: When the capacitance value of the Piezo Pickup is 10nf, it is about 20db,The lower frequency limit is 30Hz<br> Input impedance, 10MΩ<br> Size:. 65x63x24mm/2.56x2.48x0.94inch<br> Charging Interfaces: TYPE C DC5V<br> Input/Output:6.35mm 1/4TS<br> Output Impedance:600Ω<br> Colour:Black<br> Material:ABS<br> Package Contents:<br> 1 * Chip Piezoelectric Pickup<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.