The Blue Heat pepper spray is an effective and reliable self-defense tool that you can carry with you every day. The 1/2 oz canister features a twist-top safety actuator to help prevent accidental discharges and it even glows in the dark, allowing you to activate the spray and fire it easily in low-light or no-light situations. When used, Blue Heat delivers two powerful effects. First, the 2 million SHU (Scoville Heat Units) formula causes an intense burning sensation to the eyes, nose, throat, skin and lungs of an attacker, lasting up to 45 min, providing you with ample time to escape. Secondly, the spray contains a blue dye that marks the attacker's skin for up to 48 hr, helping law enforcement identify them if they flee, preventing further harm. Each canister delivers 6-8 one-second bursts, with a range of 8 to 12 feet. With a 36-month shelf life and proudly Made in the USA, Blue Heat pepper spray is an essential tool for personal protection. Additionally, it can be used to replace spent canisters for the Eliminator Blue Heat Keychain Pepper Spray (see accessories).