Double G0 Guitar Pickup Resonance Pickup Electric Bass Guitar Preamplifier Coil Soundhole Pickup with Chorus Delay Reverb Effect Preamp and Effects System for 96-104mm Sound-hole The same frequency vibration technology can efficiently release the sound effect of DSP chip so that the guitar can have reverberation chorus and delay effects without plug-in and external effector. Double G0 Guitar Pickup Resonance Pickup Electric Bass Guitar Preamplifier Coil Soundhole Pickup with Chorus Delay Reverb Effect Preamp and Effects System for 96-104mm Sound-hole: Unplugged with DSP reverberation effect.Ergonomic design more humanized control.Sound hole vibration pickup with reverberation chorus and delay effect.Cork pad clamp no damage to paint of instrument.Using the same frequency resonance system to amplifies the guitar s sound 30~50%.Sound hole installation no need drill hole easy to install.Magnetic coil microphone and phase independent adjustment. Specifications: Package Weight: 485g / 17.11oz Material: ABS Package Size: 17.5 * 15.2 * 5.5cm / 6.89 * 5.98 * 2.17in Battery: 3.7V 2000mAh Suitable for: 96-104mm soundhole Packing List: 1 * Pickup 1 * Output Tail Nail 1 * Screwdriver 2 * Gasket 1 * Cable 1 * Vibrating Horn 1 * Tail Nail Leather Cover 2 * Clip