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