Peterson TP-3 Clip-On Tuning Pickup includes a more sensitive piezo pickup than any previous model to improve the signal transmission of your instrument into your tuner. The larger opening can now accommodate even the most challenging placement. Higher gripping tension and padded jaw ends ensure that the TP-3 stays in place without damaging your instrument. Use with any instrument and any tuner and totally isolate your instrument from any other disruptive sounds permitting confident tuning even in the noisiest environments. 1/4″ input jack is compatible with many instrument tuners with long, heavy-duty cord with strain relief for added durability and longer life. The perfect accessory when used with original Peterson tuning hardware. No batteries required.