Simply slide the thumb-switch forward to release 4.9 milliamps of electricity to make anyone think twice before bothering you. Release the thumb-switch and it retracts with ease. Complete with LED flashlight, wrist strap, and made from the highest quality aircraft aluminum. The SLIDER features a quick charging micro-usb port and can be conveniently charged from most cell phone chargers. Includes charger, charging cord, and wrist strap. 31⁄2” x 1” x 1⁄2” LIFETIME WARRANTY.