Schertler Lydia OBElectrostatic under saddle transducer for acoustic and classical guitarsNominal impedance 100 OhmFrequency range from 20 Hz to 18 kHz (+/- 3dB)Electronics Discret circuit Class AConnections Jack Stereo 6.3mmBattery life ca 250hBattery 9VControls volume, trebble, bass, gain, bat chack on soundholePickup Lydia Electrostatic transducer15 years of research and development in the field of under-saddle systems has culminated in Schertler’s LYDIA. This revolutionary air chamber technology built around an ultra linear condenser microphone, with solid diaphragm and integrated electronic settings, has been specially designed to reproduce the true sound of your instrument. Safe and reliable in all kinds of performance situation,it delivers an impressive sound with enhanced dynamic.LYDIA ONBOARD has an CLASS-A onboard preamp (on the shoulder of the instrument), with volume, bass, mid, treble, battery check and PAD controls. A standard 9V battery is supplied.