SE series: S: small EQ, this series is designed in order to use a small size pre-amplifier, and we design SE series based on TOPS series, and the smaller external dimension of the product offers shorter product installation curve, which is suitable to be installed in more different shapes of guitars. The bottom of the product adopts wholly sealed metal shell to efficiently reduce noise, and this series of products that adopts piezo ceramics pickups is featured with large output, compact bass and invigorative alto voice and clear and loud high pitch, which exhibits the timbre featured by the excellent piezo ceramics pickup.