The ampliphon pickup is a powerfull passive triple piezo pickup with a high impedance. It has a tunable low pass filter within the jack plug to adapte the tonality. It is very suitable for string instruments such as guitar, ukulélé, mandolin and more.Technical specifications:Output power: 600mVImpedance: 600OhmBandwidth: 5-10000HzOutput plug: 6,3mm female jackFWF PICK UP systems, entirely hand made in France by Franck Fromy, an engineer whose passion in life is to create perfect sound reproduction.Twenty years ago Franck created his own company in Paris, meeting the demanding needs of professional musicians for custom built pick- ups and superior microphones.A standard product was developed and word spread!.....now many of France's top musicians are using Franck's pick- up system, and enjoying the wonderful natural sounds it brings with it.Today Franck Fromy lives and works in central France, dedicating all his time to producing the now internationally recognised FWF line of pick-ups and microphones, making many new friends in the process!