... water gun. You just need to install the batteries, fill with water, pull the trigger lightly, the gun will spout out water continuously ... modeling will stimulate your children to become a sharpshooter.3. Open the cell box in the back of the gun with a screwdriver, ... .4. Push the red switch to the right, take down the gun grip, fill with water, and then push the switch to the left, now, ready to shoot!