The AD-01 is a powerful, low profile pickup that was specially designed for the autoharp. Due to its" low profile (it is only 1/4" thick) it may be mounted on the soundboard of the instrument right under the strings if there is enough clearance. Or, if you wish, it can be mounted on the underside of the top or on the inside back or outside back of the instrument. The pickup comes complete and ready to use. It is prewired to a 1/4" output jack that is easily mounted to the string anchor block with the supplied clip and small screw. This pickup has been designed to operate properly and sound terrific without the use of a preamp when plugged into any "normal" amp (guitar amp, bass amp, etc.). If you require the added ability to be able to plug directly into a P.A. or mixer then you may wish to add one of Schatten"s Preamp/DI units to your pickup system. Each pickup is hand built and tested in Schatten"s workshop to ensure good sound. As well, each pickup is warranted for a period of two years from date of purchase.