This frame will fit Non ACT 98 Custom markers and Alpha Black Markers The E-Trigger™ Electronic Upgrade Kit includes five firing modes (semi-auto, auto-response, full-auto, 3-shot burst, turbo) that can be changed in seconds for rapid (up to 17 balls per second) firing. Requires 9-volt battery. Features: Semi-Auto: Fires 1 Shot for each trigger pull. Auto-Response: Fires 1 Shot for each trigger pull or release. Full Auto: Fires Repeatedly as long as the trigger is held. 3 Shot Burst: Fires 3 Shots for each trigger pull. Turbo: Fires 1 shot for every trigger pull, fires 1 shot for every trigger pull or release if the time between trigger pulls is less than .25 seconds.