|Convert your US Army Alpha Black or Project Salvo to an electropneumatic marker! Select-fire modes, super-light trigger pull! The E-TriggerT 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. Fits the Tippmann US Army Alpha Black and Project Salvo markers.