These triggers were created using vectored amplitude measurements (VAM), a specially created transducer solution that allows the Acoustic Pros to outperform existing drum sensors (piezo element) in producing a natural response, while greatly reducing the frequency of double triggering and crosstalk. With superb tracking ability, these triggers set a new standard for trigger microphones, requiring no adhesives whatsoever while still offering excellent durability. XLR-Output for professional connection. Fits most types of moulded hoops. No adhesive is needed. Safely secured at the hoop with a standard tension rod. Sturdy construction. All parts are interchangeable.