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: Using the same frequency resonance system to amplifies the guitar s sound 30~50%.Magnetic coil microphone and phase independent adjustment.Cork pad clamp no damage to paint of instrument.Sound hole vibration pickup with reverberation chorus and delay effect.Unplugged with DSP reverberation effect.Ergonomic design more humanized control.Sound hole installation no need drill hole easy to install. Specifications: Package Size: 17.5 * 15.2 * 5.5cm / 6.89 * 5.98 * 2.17in Suitable for: 96-104mm soundhole Package Weight: 485g / 17.11oz Battery: 3.7V 2000mAh Material: ABS Packing List: 1 * Output Tail Nail 1 * Screwdriver 2 * Clip 1 * Pickup 1 * Vibrating Horn 1 * Cable 1 * Tail Nail Leather Cover 2 * Gasket