This is a "classic style" contact microphone, mounted to a guitar cable and terminated with a standard 1/4" guitar plug. What separates this microphone from commercially available models are its technical specifications and new additions. A bit different from its previous incarnations here at CS, the improved Classic features extra-durable guitar plugs, a newly reenforced piezo design (the piezo disc measures 3.5 cm in diameter), and longer cable (approximately 4' in length). It's a fantastic all-around / all-purpose microphone. Whether you're at home in the studio or out there, on the road*, the Classic Contact Microphone is ready to plug in and play!