D-Tar Wave Length Multi Source Nylon, Active piezo pickup for installation in an acoustic guitar bridge, For guitars with 1/8" or 3/32" bridge saddles, 18V preamp for a second source, Separate controls for master and microphone level, Optional stereo function for 2 channel amps (e.g. D-TAR Solstice), For nylon string guitars, Operation with 2 x 1,5V AA batteries, Made in U.S.A.