Clips directly onto bridge; 1/4-Inch jack. Universal pickup for brass, woodwind, and bowed instruments. External transducer clips directly; instrument bell; bridge for precise tuning; Made in Korea; How to use the MPU2 transducer: Connect the MPU2 plug into the input jack of your tuner. For bowed instruments: Clip the MPU2 onto the center; the bridge under the strings. For brass and woodwind instruments: Clip the MPU2 securely; the bell; the instrument. When tuning; complete, carefully remove MPU2 from your instrument.