Description de chez Amazon USA : - Professional Piezo Microphone Instrument Pickup/Piezo Transducer - 1/4" jack with 9 inch cable - Includes velcro but not putty attachment options - Just plug it into your amp, or other recording equipment - Can be mounted on virtually any acoustic instrument including Guitars, violins, pianos, horns, harmonicas and even on your neck to pick up your voice! - Has the advantage of being able to eliminate interfering external sounds and not be influenced by sound reflections from nearby objects.