The Z-FORCE stun guns offer a unique, slim style. Makes it easier to grip and use for those with smaller hands. Comes with wrist strap and safety switch. SG-N2 $7.00 Nylon and Velcro Stun Gun Holster Z-FORCE has a LIFETIME WARRANTY. The ZF-ST (300,000 volts) uses two 9-volt batteries and the ZF-SM (100,000 volts) uses one 9-volt battery.