New PRO-REP-103 Fishman Rare Earth Mic Blend I never used it after purchasing it! It's new and unused! The Rare Earth Blend creates a combination of percussive attack, sustain with box resonance, and ambient feel from the microphone. This system allows for three-dimensional sound creation, and the balance of each microphone can be adjusted with the blend control on the main unit. It can be installed simply by clamping it in the soundhole. - Type: Acoustic guitar pickup - Soundhole mounting type, endpin jack - Active, uses button battery (SR44 compatible) - With Mic/Pickup blend control The included batteries are for testing purposes, so please use new batteries.