The MB750 is a very performant active amplification system with a HI-FI electret directional microphone and a quadruple piezo pickup connected to an alimentation box "phantom" which will also allow you to tune the low pass filter, the sensitivity of the microphone and the volume.Technical specifications:Power: 12V batteryMax consumption: 2mAImpedance: 58dBOutput plug: 2X 6,3mm female jackBAT-V23GA battery availableFWF 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!