This Tornado 3 in 1 pepper spray system is about the size of a cell phone. It is lightweight and easy to you and can be accessed and deployed in one second. A single button releases the unit from the base and instantly you have a powerful 10% oleoresin capsicum (2 million Schoville Heat units) pepper spray ready for use. This tornado unit discharges eight one second bursts of law enforcement strength stopping power up to 12 feet. With the built in finger lock you always know the unit is pointed in the right direction so you cant spray yourself). The unit measures three and one-half inches x two and one quarter inches. A free belt clip is included with the unit and any of the tornado accessories will fit this model (TVD007, THD004).