To use the grenade carefully pull out the safety pin and throw. What should happen is when the pin is in any extra pressure in the grenade pushing against the BB (like the pressure from dropping it or bumping it while running) will try to push the BB out but the pin will stop the BB. When you remove the pin, as long as your carefull the BB will stay in the neck of the grenade and the collar will help it stay there. When the grenade hits something the extra pressure will push the BB out and the paint will be sprayed every where in the area. The pressure for tube will cause the grenade to spin so the paint should sray all around. If you keep the pin and find the empty grenade you can re-fill it, put a new BB in and you can re use it. The splatter zone (area that the paint covers) varies but is usally around or over 1.5 meters. Have fun!