With their superb tracking ability, Acoustic Pro triggers set a new standard of trigger mechanics. With absolutely no adhesives required, the ddrum triggers clamp onto the sides of standard drum hoops.Original Ddrum kick trigger with VAM Trigger Technology. XLR input for secure connection, Roadworthy construction. Best if used with Ddrum 6999 cable or any after market cable that is XLR to 1/4 with PIN 2 HOT.