Upgrade your marker for a variety of firing options with the external mode X7 e-Grip. Can shoot up to 20 BPS and features 5 firing modes that can be changed on the fly, including semi auto, turbo, 3-shot safety burst, auto response and full safety auto. New weatherproof system is great for woodsball play. Internal mode system can also be set to semi-auto to meet the regulations of any organized field event. Requires 9 volt battery not included.