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 snare trigger with VAM Trigger Technology. Dual zone trigger that translates head and rim hit separately. XLR Input for secure connection, roadworthy construction - Best if used with Ddrum 6997 cable to utilize dual zone functions.