Simply discharging the stun creates a loud and intimidating spark that can scare attackers before they make their move. For your safety there is a 3 level activation feature to prevent accidental discharge. Additionally, there is a built-in 3 watt CREE LED 150-lumens flashlight with 5 distinct modes: 100%, 50%, 30%, strobe, and SOS for emergency responders to find you quickly. The baton is made of a military grade aluminum alloy shock proof exterior and is approximately 13.5 inches long. The stun baton runs two included 3.7 V Li-ion 4000mA rechargeable batteries, which can be charged with the charging port or wall charger.