1/2 oz. Flip Top key-chain is now available! The new flip top design makes this unit the easiest-to-use keychain yet. The flip top allows you to fire with your thumb or your index finger easily which makes for fast and easy deployment when needed. The spring loaded flip top is the safety that prevents accidental firing, so there is nothing else to unlock or turn which saves you valuable seconds in an emergency situation. This new design also eliminates the need for strong fingers. The actuator is easy to depress and fire the unit. This is the prefect design for elderly persons or people with weak finger strength. This unit is compact and easy to carry measuring only 3.75". It is ideal for keeping in a purse a car or just carrying with your keys. This is something every woman should be carrying. Great protection and a very attractive unit.