The X2 model, shown here, holds two cartridges, so it can fire two sets of darts without reloading. Taser markets several different cartridges with ranges from 15 feet to more than 25 feet.

Hampshire and Isle of Wight Constabulary and Thames Valley Police will be rolling out the new Taser 7 over the next 12 months. They will replace the existing X2 models and have two cartridges ...