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