D-Tar Wave Length Multi Source Steel, active piezo pickup with preamp for under bridge construction, for guitars with 1/8" or 3/32" saddle, preamp 18V with input for a second source, volume module for separte adjustment of master and mic volume, optional stereo-function for connectng to a two channel preamp (e.g. D-TAR Solstice), for steelstring guitars, battery powered with 2x 1,5V AA batteries, made in USA